Test tagging old commit

Updates to link checking (#26)

* Add hyperlinks to README.md

* Add some link checkers to cicd.yml

* Add file argument for adriancoman/link-checks-action

* Remove bare links from README.md

* Markdown linting in README.md

* Split out link checker actions in cicd.yml

* Comment out lychee fail in cicd.yml

* Create .lycheeignore

* Add cron schedule to cicd.yml

* Update cron time (UTC) cicd.yml

* Cron only runs on default branch

* Update cron time in cicd.yml