Improve image compression and remove cruft

While investigating other issues it was observed that several
sets of images in the repository were larger than they needed
to be. This commit corrects that oversight with only lossless
methods, yielding just under an average of a 50% reduction in
file size. Also several cruft files such as text editor backups
and .DS_Store files were removed as encountered.

Signed-off-by: Peter J. Mello <admin@petermello.net>

.gitignore

@@ -1,7 +1,3 @@
 /site
 .DS_Store
-**/.DS_Store
+.venv
-.DS_Store
-docs/.DS_Store
-.DS_Store
-.venv

docs/guides/navigating.md.backup

@@ -1,77 +0,0 @@
-# Navigating
-
-Navigating on RetroArch is as easy as you can imagine. Depending on the device you have, the control scheme is determined automatically. For example, if you are going to use it on a computer, the basic key combinations of the keyboard will apply. You move with the arrow keys and select with the *Enter* key, and you return with the *Backspace* key. If you plug a controller, you can also move with the D-Pad buttons.
-
-The default [GUI](GUI) for RetroArch is [Ozone](ozone.md). While the "skin" may differ on certain platforms, basic layout and navigation remains broadly the same.
-
-## PC
-
-By default the keyboard should be ready to use.
-
-Using the *left* and *right* arrow keys, you move to a different tab, each tab will relate to an aspect of the RetroArch experience (main menu for game loading, settings for settings etc.). Once the desired tab is selected, use the *up* and *down* arrow to move to an option.
-
-To advance in the menu press *Enter* (or *Return*). To go back to the previous menu push *Backspace*.
-
-Whilst in a game use the *F1* key to open the [Quick Menu](quick-menu.md).
-
-Pushing *Esc* twice will quit the program.
-
-### Main Menu
-
-![Ozone's Main Menu](../image/retroarch/ozone/first_run.webp)
-
-Welcome to the main menu. This is where you will launch games, download and update cores, and have access to freely available content. *Load Core*, *Load Content* and the *Online Updater* are the menu items you will probably be using the most.
-
-*See [Starting a Game](starting-a-game.md)*
-
-### Settings
-
-![Settings](../image/retroarch/ozone/settings.png)
-
-Here you will find all the options available to configure RetroArch, from Graphics, Input, Sound and everything else.
-
-### Favorites
-
-![Favorites](../image/retroarch/ozone/favorites.png)
-
-Favorites allow yous to maintain a short list of games for quick access. You can add content to this playlist from the [Quick Menu](quick-menu.md) or before launching it.
-
-### History
-
-![History](../image/retroarch/ozone/history.png)
-
-Recently launched content will be added to this Playlist. The content you ran last will be at the top.
-
-### Image, Music and Video
-
-These tabs will handle all your media. Images will contain any screenshots you've made.
-
-### Netplay
-
-RetroArch relies on peer-to-peer networking to reduce network latency and ensure the best possible experience. It allows multiplayer over the internet. The user can host or join a network gaming session, or use the Spectator mode to watch others play. RetroArch has a built-in netplay lobby.
-
-### Import content
-
-![import-content](../image/retroarch/ozone/import-content.png)
-
-Either you scan automatically, so that any content that matches the internal database will be added to Playlists, or you scan manually, not being dependent on the database so you can freely add your content to Playlists.
-
-## Mobile
-
-The mobile interface, [GLUI](glui.md), is much more minimalistic compared to the PC's interface. Touch is the default input, although depending on device other options may be available. There are three different tabs, which can be switched at the bottom of the menu.
-
-### Main Menu
-
-![GLUI's Main Menu](../image/retroarch/glui/glui-main.png)
-
-The main menu will be where you launch games, download and update cores, start or join netplay sessions and pretty much anything to do with gaming.
-
-*See [Starting a Game](starting-a-game.md)*
-
-### Playlists
-
-Handles anything to do with creating and maintaining playlists. It gives you scanning options to recognise your game collection. It also provides access to your images, music and videos.
-
-### Settings
-
-Here you will find all the options available to configure RetroArch, from Graphics, Input, Sound and everything else.

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