[dist] shrink png asset size with optipng, scripts to generate assets (#2573)

Signed-off-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: #2573
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

docs/Development.md

@@ -69,6 +69,18 @@ cmake --build /tmp/ramdisk -- -j32
 sudo umount /tmp/ramdisk
 ```
 
+# Assets and large files
+
+A general rule of thumb, before uploading files:
+- PNG files: Use [optipng](https://web.archive.org/web/20240325055059/https://optipng.sourceforge.net/).
+- SVG files: Use [svgo](https://github.com/svg/svgo).
+
+May not be used but worth mentioning nonethless:
+- OGG files: Use [OptiVorbis](https://github.com/OptiVorbis/OptiVorbis).
+- Video files: Use ffmpeg, preferably re-encode as AV1.
+
+# Debugging
+
 ## Debugging (host code)
 
 Ignoring SIGSEGV when debugging in host: