added gerber file for jlcpcb (#20) Co-authored-by: Sanic

README: collect debugging/troubleshooting info

soldering instructions: link LED data sheet related to https://github.com/kinx-project/kint/issues/13

README: clarify solder instruction regarding vertical pin header related to https://github.com/kinx-project/kint/issues/13

reference kint36 pull request

README: which teensy: add consideration regarding advanced QMK feats

README: link adapter board

kint2pp: link to QMK commit

kint2pp: reference QMK pull request

update README for release