chore(deps): move remaining packages from :load-path to :vc; drop archived org-gcal

The three packages that still loaded from local checkouts now install
via :vc:

- chime → git@cjennings.net:chime.git (was :load-path "~/code/chime")
- wttrin → git@cjennings.net:emacs-wttrin.git (was :load-path
  "/home/cjennings/code/emacs-wttrin")
- org-msg → https://github.com/jeremy-compostella/org-msg (was
  :load-path "/home/cjennings/code/org-msg"; switching to upstream
  rather than a fork since the previous fork wasn't carrying any
  active changes)

For the two cjennings.net repos this matches the org-drill (be3e227)
and gloss (2e12131) shape: primary on cjennings.net, post-receive
hook mirroring to GitHub. The previously-commented :vc URLs in chime
and wttrin pointed at GitHub directly, which would have lost the
cjennings-first convention if uncommented later.

Also drops :ensure nil on chime (only relevant under package.el, not
:vc) and removes modules/archived/org-gcal-config.el. Nothing in
init.el or any module references org-gcal, so the file is genuinely
unused.

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