Dan Docs

[Dan Docs](https://shonumi.github.io/dandocs.html) documents more obscure Game Boy hardware.
It is rendered from here https://github.com/shonumi/shonumi.github.io/blob/master/dandocs.html, which in turns comes from GBE docs : https://github.com/shonumi/gbe-plus/blob/master/src/docs/technical/dandocs.html, manually converted to HTML from the TXT files in the same folder, like this one: https://github.com/shonumi/gbe-plus/blob/master/src/docs/technical/Mobile_Adapter_GB.txt

We could script something to automatically render those TXT as MD and then have our new Pan Docs website render an updated (an in sync with Shonumi/GBE docs) version of Dan Docs.

Dan Docs is public domain, but the author, @Shonumi mentioned:
> There may be an issue with some disassembly from Zok Zok Heroes (which I've been meaning to address).