Rename site to "Northstar Documentation"

from "Northstar modding docs" as it now covers both Wiki and ModdingDocs

mkdocs.yml

@@ -1,4 +1,4 @@
-site_name: Northstar modding docs
+site_name: Northstar Documentation
 site_url: https://docs.northstar.tf/
 repo_url: https://github.com/R2Northstar/NorthstarDocs
 edit_uri: blob/main/docs/