fixing more typos

Author: mattmakai

content/pages/04-web-development/42-websockets.markdown

@@ -173,10 +173,6 @@ own project.
   that demos sending server generated events as well as input from users
   via a text box input on a form.
 
-* The [realtime codenames game](https://github.com/joshporter1/codenames) 
-  source code is a full-featured example for using WebSockets via 
-  Flask-SocketIO.
-
 * The 
   [python-websockets-example](https://github.com/mattmakai/python-websockets-example)
   contains code to create a simple web application that provides WebSockets

content/pages/04-web-development/43-webrtc.markdown

@@ -33,10 +33,6 @@ browser) and server (usually a [web server](/web-servers.html)).
   at points but overall has a ton of good information that gives a solid
   overview of the technology.
 
-* [Building a Snapchat-like app with WebRTC in the browser](https://tokbox.com/blog/building-a-snapchat-like-app-with-webrtc-in-the-browser/)
-  walks through the front end JavaScript for building a photo filter
-  application using the WebRTC browser APIs.
-
 * [WebRTC issues and how to debug them](https://blog.codeship.com/webrtc-issues-and-how-to-debug-them/)
   explains the various ways that implementations can go wrong and where
   to start looking when you run into errors.

content/pages/04-web-development/48-api-creation.markdown

@@ -130,12 +130,8 @@ equivalent of browser testing in the web application world.
   compatibility and a whole slew of other great advice for developers
   and API designers.
 
-* [Self-descriptive, isn't. Don't assume anything.](http://www.bizcoder.com/self-descriptive-isn-t-don-t-assume-anything)
-  is an appeal that metadata makes a difference in whether APIs are descriptive
-  or not.
-
 * [Designing the Artsy API](http://artsy.github.io/blog/2014/09/12/designing-the-public-artsy-api/)
-  has their recommendations list for building an API based on their recent
+  has their recommendations list for building an API based on their 
   experiences.
 
 * Hacker News had a discussion on 
@@ -212,10 +208,6 @@ equivalent of browser testing in the web application world.
   [Serpy](https://github.com/clarkduvall/serpy) and 
   [wrote a blog post with the results of its performance](https://engineering.betterworks.com/2015/09/04/ditching-django-rest-framework-serializers-for-serpy/).
 
-* [Designing a Web API](http://restlet.com/company/blog/2015/03/16/api-design-designing-a-web-api/)
-  gives a detailed walkthrough of concepts and design decisions you need
-  to make when building an API.
-
 * Microsoft's 
   [REST API Guidelines](https://github.com/Microsoft/api-guidelines/blob/master/Guidelines.md)
   are a detailed set of considerations for when you are building your own

content/pages/04-web-development/51-api-integration.markdown

@@ -63,9 +63,6 @@ across many implementation areas.
   is a nice tutorial for easily re-executing failed HTTP requests with the
   Requests library.
 
-* My DjangoCon 2013 talk dove into 
-  "[Making Django Play Nice With Third Party Services](http://www.youtube.com/watch?v=iGP8DQIqxXs)."
-
 * If you're looking for a fun project that uses two web APIs within a 
   Django application, try out this tutorial to 
   [Build your own Pokédex with Django, MMS and PokéAPI](https://www.twilio.com/blog/2014/11/build-your-own-pokedex-with-django-mms-and-pokeapi.html).

content/pages/04-web-development/52-twilio.markdown

@@ -77,10 +77,6 @@ for fellow developers.
   [Twilio SMS API via some Python code](https://www.twilio.com/docs/quickstart/python/sms) 
   to send a text message with the results.
 
-* IBM's Bluemix blog contains a nice tutorial on building an 
-  [IoT Python app with a Raspberry Pi and Bluemix](https://developer.ibm.com/bluemix/2015/04/02/tutorial-using-a-raspberry-pi-python-iot-twilio-bluemix/)
-  that uses Twilio to interact with the Raspberry Pi.
-
 * The [Python tag on the Twilio blog](https://www.twilio.com/blog/tag/python)
   provides walkthroughs for 
   [Django](https://www.twilio.com/blog/2015/12/city-chat-with-python-django-and-twilio-ip-messaging.html), 

content/pages/04-web-development/56-web-app-security.markdown

@@ -110,7 +110,7 @@ resources can also give you a good overview of how HTTPS works.
   learn about web browser internals, session attacks, fingerprinting, HTTPS
   and many other fundamental topics.
 
-* [The SaaS CTO Security Checklist](https://cto-security-checklist.sqreen.io/)
+* [The SaaS CTO Security Checklist Redux](https://www.goldfiglabs.com/guide/saas-cto-security-checklist/)
   is an awesome list of steps for securing your infrastructure and employees
   as well as what stage and size company it is recommended that you put those
   procedures in place.

content/pages/05-deployment/02-servers.markdown

@@ -128,8 +128,8 @@ provides a unified API for many cloud service providers.
 
 * [Amazon Web Services has official documentation](http://aws.amazon.com/python/) for running Python web applications.
 
-* [boto](https://github.com/boto/boto) is an extensive and well-tested 
-Python library for working with Amazon Web Services.
+* [boto3](https://github.com/boto/boto3) is an extensive and well-tested 
+  Python library for working with Amazon Web Services.
 
 * [Poseidon](https://github.com/changhiskhan/poseidon) is a Python commandline
   interface for managing Digital Ocean droplets (servers).

content/pages/05-deployment/19-nginx.markdown

@@ -63,7 +63,7 @@ to make sure you are avoiding the most common security errors that plague
 HTTP(S) configurations.
 
 * [HTTPS with Let's Encrypt and nginx](https://botleg.com/stories/https-with-lets-encrypt-and-nginx/)
-  walks throough installing a free SSL certificate from Let's Encrypt
+  walks through installing a free SSL certificate from Let's Encrypt
   to secure HTTP connects to your nginx server via HTTPS.
 
 * The [Nginx Config](https://nginxconfig.io/) tool can generate strong 
@@ -101,7 +101,7 @@ several years.
 
 * [Test-driving web server configuration](https://gdstechnology.blog.gov.uk/2015/03/25/test-driving-web-server-configuration/)
   tells a good story for how to iteratively apply configuration changes, such
-  as routing traffic to [Piwik](http://piwik.org/) for 
+  as routing traffic to [Matoma](https://matomo.org/) for 
   [web analytics](/web-analytics.html), reverse proxying to backend
   application servers and terminately TLS connections appropriately.
   It is impressive to read a well-written softare development article like

content/pages/06-devops/18-web-analytics.markdown

@@ -38,9 +38,10 @@ application before taking some action, such as purchasing your service.
 
 
 ## Open source web analytics projects
-* [Piwik](http://piwik.org/) is a web analytics platform you can host yourself.
-  Piwik is a solid choice if you cannot use Google Analytics or want to 
-  customize your own web analytics platform.
+* [Matoma](https://matomo.org/) (formerly Piwik), is a web analytics 
+  platform that you can host yourself. Matoma is a solid choice if you 
+  cannot use Google Analytics or want to customize your own web analytics
+  software.
 
 * [Shynet](https://github.com/milesmcc/shynet) is a lightweight, privacy-friendly 
   cookie-free web analytics application written in Python.
@@ -142,8 +143,8 @@ application before taking some action, such as purchasing your service.
 
 
 ## Web analytics learning checklist
-1. Add Google Analytics or Piwik to your application. Both are free and while 
-   Piwik is not as powerful as Google Analytics you can self-host the 
+1. Add Google Analytics or Matoma to your application. Both are free and while 
+   Matoma is not as powerful as Google Analytics you can self-host the 
    application which is the only option in many environments.
 
 1. Think critically about the factors that will make your application