Migrate docs to Github

[mdroidian]

TODO

• [x] Migrate images to /media/
• [x] add clickable screenshots to videos

*didn't add clickable screenshots to most, they will be re-recorded.

[dvargas92495]

Please tell me you used some form of Markdown export instead of doing all of this manually lol

[mdroidian]

Haha yeah, roamjs graph Markdown export. Flat Markdown unless there were lots of bullets 👍.