pkgdown 2.0.5

• Correctly generate downlit link targets for topics that have a file name
  ending in . (#2128).

• build_articles(): if build fails because the index doesn't include all
  articles, you're now told what articles are missing (@zkamvar, #2121).

• build_home() now escapes angle brackets in author comments(#2127).

• build_home() will automatically render and link .github/SUPPORT.md
  (@IndrajeetPatil, #2124).

• build_news() once again fails to link @username at start of
  bullet. I had to reverted #2030 because of #2122.

• build_reference(): restore accidentally nerfed has_keyword() and
  has_concept() reference selectors (#2126) and add tests.