Replace README.md of the Drafts folder with deprecation notice (#822)

* Replace README.md of the Drafts folder with deprecation notice
* Improve formatting of depreaction note.
  Also try to appease markdownlint ...
* More markdownlint: trailing space & relative links.

Signed-off-by: Markus Hentsch <[email protected]>
Signed-off-by: Kurt Garloff <[email protected]>
Co-authored-by: Kurt Garloff <[email protected]>

Author: markus-hentsch

Drafts/README.md

@@ -1,5 +1,11 @@
-# Design-Docs
+# Drafts Archive
 
-Design Documents, Architecture etc. for SCS and related technology
+## Deprecation Notice
 
-Here we collect docs that cover overarching SCS topics or topics that otherwise do not belong to an existing repository.
+> [!CAUTION]
+> Please do not create new files in this folder!
+
+The contents of this folder are for archival purposes only. New drafts belong
+in the [`../Standards/`](https://github.com/SovereignCloudStack/standards/tree/main/Standards)
+folder instead and adhere to the lifecycle described in
+[scs-0001-v1-sovereign-cloud-standards](https://github.com/SovereignCloudStack/standards/blob/main/Standards/scs-0001-v1-sovereign-cloud-standards.md).