make install instructions nicer (#1366)

* make windows instructions nicer

* make macOS instructions nicer

* create page for portable packages

* create page for automatic installers

* remove macos.md and windows.md

their contents have been moved to portable.md and automatic-installer.md

* move portable to manual and add some other installation methods

* community packages page

* remove linux.md

contents moved to other pages

* add link to freebsd package

* order of pages

* fix broken link

* fix links on index page

* order of pages again

* josh wording

* remove macOS delete config docs

* rework links

* create advanced install category

* separate automatic installer into OSes

* move synology to advanced

Every time someone complains about HWA on a NAS it's always Synology

* rework index links

* fix redirects

* reorder advanced category

* move truenas to advanced

* cleanup redirects page a bit

redirects.ts

@@ -31,12 +31,17 @@ const redirects: ClientRedirects.Options['redirects'] = [
     to: '/docs/general/installation/'
   },
   {
-    from: '/docs/general/administration/install/synology',
-    to: '/docs/general/installation/synology'
+    from: [
+      '/docs/general/administration/install/synology',
+      // synology moved
+      '/docs/general/installation/synology'
+    ],
+    to: '/docs/general/installation/advanced/synology'
   },
+  // installing from source moved
   {
-    from: '/docs/general/administration/building',
-    to: '/docs/general/installation/source'
+    from: ['/docs/general/installation/source', '/docs/general/administration/building'],
+    to: '/docs/general/installation/advanced/source'
   },
   // "traefik2" moved
   {