README: clarify LED debugging step only works without Teensy

README: update aisler link to v2021-06-26 revision

update artifacts for v2021-06-26

connect GND3 (Teensy vertical pin header) to GND This removes the unexpected opens from the design. fixes https://github.com/kinx-project/kint/issues/38

README: link to pending qmk pull request for kint41

README: put input latency column instead of USB version The USB version is what influences the input latency.

README: add pricing to board offers

README: add aisler link (board verified to work)

Update README to reflect new jumpers

Add more jumpers for Teensy++ 2.0 compat This avoids requiring folks to pull pins out of headers for Teensy++ 2.0 compatibility, instead just requiring them to cut the traces, which I think is better and more importantly is reversible, so that if someone builds with a Teensy++ 2.0 and then wants to replace it with a 3.6, they can just re-close the new jumpers, desolder the old ones, and be good to go.