tic 0.11.0

• Templates: On Linux, system libraries are now installed via remotes::system_requirements() (#300)
• Instead of using an exact version tag, the core GHA actions are now referenced using a dynamic major version tag (e.g. v2 instead of v2.3.4).
  This includes an update of the templates to the latest revision date 2021-06-26.
• do_pkgdown() macro now also builds the site on on branches containing the word cran.
  This adds support for the {fledge} release mechanism when using both a development and release site (#303)
• update-tic.yml: Remove hardcoded reference to master branch
• update_yaml() is not in beta state anymore