docs: the old v5 docs now point to docs.nadeko.bot and nadekloud

.readthedocs.yaml

@@ -1,19 +1,8 @@
-# Read the Docs configuration file for MkDocs projects
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
 version: 2
 
-# Set the version of Python and other tools you might need
 build:
-  os: ubuntu-22.04
-  tools:
-    python: "3.12"
-
-mkdocs:
-  configuration: mkdocs.yml
-
-# Optionally declare the Python requirements required to build your docs
-python:
-  install:
-  - requirements: mkdocs-requirements.txt
+  os: ubuntu-24.04
+  commands:
+    - mkdir -p $READTHEDOCS_OUTPUT/html
+    - cp docs/index.html $READTHEDOCS_OUTPUT/html/index.html
+    - cp docs/index.html $READTHEDOCS_OUTPUT/html/404.html