Expand release process documentation

Signed-off-by: Drew DeVault <sir@cmpwn.com>
index: add links to tutorial and project library

Signed-off-by: Vlad-Stefan Harbuz <vlad@vladh.net>
roadmap: Remove NetBSD because it's done
extlib.rst: add bcrypt, tar

Signed-off-by: Drew DeVault <sir@cmpwn.com>
Add NetBSD to supported platforms list
Replace en dashes with em dashes
Link to FAQ for language server section of editors
Remove Kakoune and Kate plugins from list

The Kakoune plugin has since been upstreamed, and the Kate grammar is bundled
in recent releases.


Kate (KSyntaxHighlighting):
Update VS Code extension
misc minor tweaks
process: add roadmap
Rehome community evangelism doc
Document supported platforms
freestanding: correct name of unensure
debugging: expand on overcommit footnote
debugging: add note about +libc and memory errors
faq: update LSP point
Address Ember's feedback
cross: LLVM does not actually work anymore
Flesh out freestanding docs

This could probably use work