Fix audit findings: bugs, security, perf, content

Bugs:
- setup-wsl: fix broken /img/WSL/* image paths (now bundle-relative;
  images were broken on the published post) + better alt text
- pi-docker-swarm: remove broken missing cluster.webp reference
- archetypes/posts.md: fix malformed {{ }} template so 'hugo new' works
- rename arrstack/arrstack.md -> index.md so it's a proper leaf bundle
- static/admin/config.yml: fix 'htpps' -> 'https' site_url typo
- fix silently-dropped <placeholder> text (unsafe=false dropped them):
  wrap <distro>/<username>/<user>/<version>/<ip address> etc in backticks
  across setup-wsl, securing-ssh, pi-docker-swarm, mc-server-on-docker

Security:
- render-link.html: add rel=noopener noreferrer to external target=_blank
- extend-footer.html: fix rel='me' trapped in class attr (broke Mastodon
  verification); add proper rel/target
- static/admin/index.html: pin Sveltia CMS to 0.172.4 via jsDelivr + SRI

Performance:
- hugo.toml: ignoreFiles for *.aseprite/*.bak (stop shipping source art;
  non-page files 23 -> 13)
- video shortcode: preload=metadata; image shortcode: loading=lazy decoding=async
- sws.toml: drop SPA page-fallback so missing paths return real 404 (404.html)

Content/SEO:
- normalize tag casing (HomeLab/RemoteAccess/SSH/HUGO -> lowercase),
  fix 'prodcutivity' typo, arrstack tags:[""] -> [], add welcome description
- delete stray index.md.bak

content/posts/mc-server-on-docker/index.md

@@ -185,8 +185,8 @@ cd .server-data
 2. **Download a Minecraft server jar file:**
 
 - [Vanilla Minecraft Server](https://www.minecraft.net/en-us/download/server)
-		- Right-click the green link that says minecraft_server.<version>.jar and copy the link address.
-		- Download with: curl -o server.jar <link you copied here>
+		- Right-click the green link that says `minecraft_server.<version>.jar` and copy the link address.
+		- Download with: `curl -o server.jar <link you copied here>`
 - [Fabric Mod loader server](https://fabricmc.net/use/server/)
 		- Select the Minecraft version, Fabric Loader Version, and the Installer Version of your choice. I tend to go with the latest.
 		- Download with: Copy the curl command under CLI download