.github: check connectivity of external links via GitHub action (#4135)#4139

Merged

yikeke merged 3 commits intopingcap:release-4.0from ti-srebot:release-4.0-89f7b0796d98

Nov 3, 2020

Commits on Nov 3, 2020

cherry pick pingcap#4135 to release-4.0

yikeke
authored and
ti-srebot
committed
Update link-check.yaml
yikeke
committed
Update technical-writing-project-ideas.md
yikeke
committed