Docs: unify 'manual' with 'guides' folder

This is one of the final steps towards strictly following
https://diataxis.fr/

lib/inventory/build-inventory/builder/default.nix

@@ -114,7 +114,7 @@ let
           warnings = [
             ''
               The '${serviceName}' module has been migrated from `inventory.services` to `inventory.instances`
-              See https://docs.clan.lol/manual/distributed-services/ for usage.
+              See https://docs.clan.lol/guides/clanServices/ for usage.
             ''
           ];
         };

lib/inventory/build-inventory/interface.nix

@@ -163,8 +163,8 @@ in
               map (m: "'${m}'") (lib.attrNames (lib.filterAttrs (n: _v: !builtins.elem n allowedNames) moduleSet))
             )}
 
-            See: https://docs.clan.lol/manual/distributed-services/
-            And: https://docs.clan.lol/authoring/clanServices/
+            See: https://docs.clan.lol/guides/clanServices/
+            And: https://docs.clan.lol/guides/authoring/clanServices/
           '' moduleSet;
     };
 

lib/inventory/frontmatter/default.nix

@@ -73,7 +73,7 @@ let
         (Legacy) ClanModule not found: '${serviceName}'.
 
         Please update your configuration to use this module via 'inventory.instances'
-        See: https://docs.clan.lol/manual/distributed-services/
+        See: https://docs.clan.lol/guides/clanServices/
       ''
     else
       ''