Make the migration guide better in the docs

docs/administration.md

@@ -62,6 +62,10 @@ copies you created in the steps above.
 
 ## Updating Paperless {#updating}
 
+!!! warning
+
+    Please review the [migration instructions](migration-v3.md) before upgrading Paperless-ngx to v3.0, it includes some breaking changes that require manual intervention before upgrading.
+
 ### Docker Route {#docker-updating}
 
 If a new release of paperless-ngx is available, upgrading depends on how

docs/migration-v3.md

@@ -74,7 +74,7 @@ See [`PAPERLESS_DBENGINE`](configuration.md#PAPERLESS_DBENGINE) for accepted val
 
 ## Database Advanced Options
 
-The individual SSL, timeout, and pooling variables have been removed in favour of a
+The individual SSL, timeout, and pooling variables have been removed in favor of a
 single [`PAPERLESS_DB_OPTIONS`](configuration.md#PAPERLESS_DB_OPTIONS) string. This
 consolidates a growing set of engine-specific variables into one place, and allows
 any option supported by the underlying database driver to be set without requiring a

zensical.toml

@@ -16,10 +16,12 @@ repo_name = "paperless-ngx/paperless-ngx"
 nav = [
   "index.md",
   "setup.md",
-  "migration.md",
   "usage.md",
   "configuration.md",
-  "administration.md",
+  { Administration = [
+    "administration.md",
+    { "v3 Migration Guide" = "migration-v3.md" },
+  ] },
   "advanced_usage.md",
   "api.md",
   "development.md",