De-submodulized the wiki folder

.github/workflows/update-readthedocs.yml

@@ -22,10 +22,10 @@ jobs:
 
       - uses: actions/checkout@v3
 
-      - name: Update wiki submodule
+      - name: Update wiki
         id: update
         run: |
-          git submodule update --remote wiki
-          git add wiki
-          git commit -m "Updating wiki [skip ci]"
+          git checkout https://github.com/XargonWan/RetroDECK.wiki.git tmp/wiki
+          cp -rf tmp/wiki/* wiki
+          git commit -m "Updating wiki"
           git push

.gitignore

@@ -15,3 +15,4 @@ retrodeck-flatpak-cooker/
 retrodeck-flatpak/
 bakcup
 .old
+tmp

.gitmodules

@@ -4,6 +4,3 @@
 [submodule "rd-submodules/shared-modules"]
 	path = rd-submodules/shared-modules
 	url = https://github.com/flathub/shared-modules.git
-[submodule "wiki"]
-	path = wiki
-	url = https://github.com/XargonWan/RetroDECK.wiki.git