docs: beautify readme + add uses

Author: dlvhdr

README.md

@@ -55,7 +55,24 @@ git config --global pager.diff diffnav
 
 ## Keys
 
-- <kbd>j</kbd>/<kbd>k</kbd> - navigate the file tree
-- <kbd>Ctrl-d</kbd>/<kbd>Ctrl-u</kbd> - navigate the diff
-- <kbd>e</kbd> - toggle the file tree
-- <kbd>q</kbd>/<kbd>Ctrl+c</kbd> - quit
+| Key                | Description                     |
+|:-------------------|:--------------------------------|
+| <kbd>j</kbd>       | Next file                       |
+| <kbd>k</kbd>       | Previous file                   |
+| <kbd>Ctrl-d</kbd>  | Scroll the diff down            |
+| <kbd>Ctrl-u</kbd>  | Scroll the diff up              |
+| <kbd>e</kbd>       | Toggle the file tree            |
+| <kbd>q</kbd>       | Quit                            |
+
+## Under the hood
+
+`diffnav` uses:
+
+* [Bubble Tea](https://github.com/charmbracelet/bubbletea) for the TUI
+* [`delta`](https://github.com/dandavison/delta) for viewing the diffed file
+
+Screenshots use:
+
+* [kitty](https://sw.kovidgoyal.net/kitty/) for the terminal
+* [tokyonight](https://github.com/folke/tokyonight.nvim) for the color scheme
+* [CommitMono](https://www.nerdfonts.com/font-downloads) for the font