chore: repoint remaining links and host-specific tooling at git.swaits.com

Covers files missed by the first pass (.svelte/.astro components, bare org and
profile links, plugin doc headers), plus content that needed rewriting rather
than a URL swap: the chezmoi bootstrap script now provisions SSH for
git.swaits.com (User git, port 2222) and initialises from Gitea.

Link labels were updated to match their new targets.

doc/tiny-packupdate.txt

@@ -1,6 +1,6 @@
 *tiny-packupdate.txt*  Minimal vim.pack updater with progress bar & results picker
 
-Author: Stephen Waits <https://github.com/swaits>
+Author: Stephen Waits <https://git.swaits.com/swaits>
 License: MIT
 
 ==============================================================================