Remove a couple more references to requirements-dev/doc

.github/workflows/slash_commands.yml

@@ -48,7 +48,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install -r requirements.txt -r requirements-dev.txt
+          pip install -r requirements.txt
 
       # add the changelog entry
       - name: Changelog Create

.readthedocs.yaml

@@ -13,7 +13,5 @@ formats:
   - pdf
 
 python:
-    install:
-      - requirements: requirements.txt
-      - requirements: requirements-dev.txt
-      - requirements: requirements-docs.txt
+  install:
+    - requirements: requirements.txt

MANIFEST.in

@@ -3,7 +3,6 @@ include CODE_OF_CONDUCT.md
 include CONTRIBUTING.md
 include LICENSE
 include README.md
-include requirements-dev.txt
 include requirements.txt
 include script/*
 recursive-include docs *.png *.md