WIP.
Merge branch 'master' into worknotes-reorg
WN: Start tracking "combining-alternatives".
WN: Start tracking "throwaway-scripts".
WN: Start tracking "hexstream-emacs-init".
WN: Start tracking "hexstream-html-doc-mode".
WN: Start tracking "with-loop-edge-cases".
WN: Start tracking "hexstream-sbcl-init".
WN: Start tracking "map-symbol-definitions".
WN: Start tracking "elevator-restarts-game".
Bring incomplete worknotes-reorg onto master, incomplete stuff in worknotes is OK.
Delete "tweets" section.

- It hasn't been updated in ages and I don't intend to ever update it again.
- Its most valuable content has already been merged into a HUGE upcoming "article".
- I deleted the merged tweets (on twitter), so they appear as plain text on the page. Ugly.
Oops, remove tweets section from sitemap.xml also.
WN: com.hexstreamsoft: Remove items relating to now-deleted tweets section.
WN: Stub pages for the 3 major metaprojects.
WN: Stub pages for "Workstacks" and "Checklists".
Update sitemap.xml to reflect new Worknotes pages.
Typo: Going down the rabbit holes, not getting down them...
WN: New workstack: explicit-bind.
WN: New checklist: "Creating a new project".