From 115MB to 60.3MB

From 115MB to 66.4MB

From 115MB to 78.6MB

All images are not optimized, sorted, and stored in a single media folder.

Updated as per new instructions added to rst cheat sheet.

SVG images from BeagleConnect C7 board schecmatic diagram.

* Still need to fix references to git repos
* Still need to remove direct link to PDF schematic

Sorry to do this last second @lorforlinux, but I believe I'm making
things simpler. I hope I am!