message: Update changelog to reflect recent commits
diff: ### Features
  - `ReferenceType`s which reference an external symbol will now include `qualifiedName` and `package` in their serialized JSON.
  +- Added clickable anchor link for member titles, #1842.
  - Added new `cname` option for GitHub Pages custom domain support, #1803
  ### Bug Fixes
  - Fixed line height of `h1` and `h2` elements being too low, #1796.
  - Code blocks in the light theme will no longer have the same background as the rest of the page, #1836.
  - Symbol names passed to `addUnknownSymbolResolver` will now be correctly given the qualified name to the symbol being referenced, #1832.
  +- The search index will now be written as JSON, reducing load times for large projects, #1825.
  ## v0.22.10 (2021-11-25)
  