RFR: Updated codeowners

[Jesper Wilhelmsson]

The codeowners list was updated with the latest new and removed directories. Also added links to directories.

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Commit messages:
 - Added changes for removed directories
 - Updated codeowners

Changes: https://git.openjdk.org/guide/pull/120/files
 Webrev: https://webrevs.openjdk.org/?repo=guide&pr=120&range=00
  Stats: 189 lines in 1 file changed: 10 ins; 1 del; 178 mod
  Patch: https://git.openjdk.org/guide/pull/120.diff
  Fetch: git fetch https://git.openjdk.org/guide.git pull/120/head:pull/120

PR: https://git.openjdk.org/guide/pull/120