Docs: move {flake, facts-vars} migration guides into 'migrations' folder

docs/mkdocs.yml

@@ -60,7 +60,6 @@ nav:
       - Backup & Restore: guides/backups.md
       - Vars Backend: manual/vars-backend.md
       - Facts Backend: manual/secrets.md
-      - Facts Vars Migration: manual/migration-facts-vars.md
       - Autoincludes: manual/adding-machines.md
       - Inventory:
           - Inventory: manual/inventory.md
@@ -75,8 +74,9 @@ nav:
           - Debugging: guides/contributing/debugging.md
           - Testing: guides/contributing/testing.md
       - Migrations:
-          - Migrate existing Flakes: manual/migration-guide.md
+          - Migrate existing Flakes: guides/migrations/migration-guide.md
           - Migrate inventory Services: guides/migrations/migrate-inventory-services.md
+          - Facts Vars Migration: guides/migrations/migration-facts-vars.md
   - Reference:
       - Overview: reference/index.md
       - Clan Services:

docs/site/guides/getting-started/index.md

@@ -54,7 +54,7 @@ clan --help
 
 ### Step 2: Initialize Your Project
 
-If you want to migrate an existing project, follow this [guide](../../manual/migration-guide.md).
+If you want to migrate an existing project, follow this [guide](../migrations/migration-guide.md).
 
 Set the foundation of your Clan project by initializing it as follows:
 

docs/site/guides/migrations/migration-facts-vars.md

@@ -2,10 +2,10 @@
 
 For a high level overview about `vars` see our [blog post](https://clan.lol/blog/vars/).
 
-This guide will help you migrate your modules that still use our [`facts`](../manual/secrets.md) backend
-to the [`vars`](../manual/vars-backend.md) backend.
+This guide will help you migrate your modules that still use our [`facts`](../../manual/secrets.md) backend
+to the [`vars`](../../manual/vars-backend.md) backend.
 
-The `vars` [module](../reference/clan-core/vars.md) and the clan [command](../reference/cli/vars.md) work in tandem, they should ideally be kept in sync.
+The `vars` [module](../../reference/clan-core/vars.md) and the clan [command](../../reference/cli/vars.md) work in tandem, they should ideally be kept in sync.
 
 ## Keep Existing Values
 

docs/site/guides/migrations/migration-guide.md

@@ -4,7 +4,7 @@ This guide will help you migrate your existing Nix configurations into Clan.
 
 !!! Warning
     Migrating instead of starting new can be trickier and might lead to bugs or
-    unexpected issues. We recommend following the [Getting Started](../guides/getting-started/index.md) guide first. Once you have a working setup, you can easily transfer your Nix configurations over.
+    unexpected issues. We recommend following the [Getting Started](../getting-started/index.md) guide first. Once you have a working setup, you can easily transfer your Nix configurations over.
 
 ## Back up your existing configuration!
 Before you start, it is strongly recommended to back up your existing