Add notice about not being able to upload new files via the API yet

Author: AlbertMN

source/includes/_files.md

@@ -1,5 +1,9 @@
 # Files
 
+<aside class="notice">
+  You cannot upload new files via the API yet - this is coming soon
+</aside>
+
 ## List Files and Folders
 
 ```shell

source/includes/_printers.md

@@ -323,6 +323,10 @@ curl https://api.simplyprint.io/{id}/printers/actions/CreateJob?pid=1234&filesys
 }
 ```
 
+<aside class="notice">
+  You cannot upload new files via the API yet - only files from your file system or print queue can be printed via the API
+</aside>
+
 This endpoint can be used to create a print job for one or more printers. The printers have to be in the `operational` state.
 
 ### Request

source/includes/_queue.md

@@ -33,6 +33,10 @@ curl https://api.simplyprint.io/{id}/queue/AddItem \
   This endpoint requires the <b>Print Farm</b> plan.
 </aside>
 
+<aside class="notice">
+  You cannot upload new files via the API yet - this is coming soon
+</aside>
+
 This endpoint adds a file to the queue. The file can either be a file on the filesystem or an uploaded stl/3mf/obj/gcode/gco/nc/npg file.
 
 **Note:** if you want to specify which printer/printer type/printer model the print job should be assigned, you can [edit the print job](#update-queue-item) after it has been added to the queue.