fix(ci): add docs workflow file to paths trigger

Changes to .gitea/workflows/docs.yml itself should also trigger
a docs rebuild so workflow fixes are immediately testable.

.gitea/workflows/docs.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - name: Checkout
         run: |
-          REPO_URL="http://gitea:3000/kindred/create.git"
+          REPO_URL="http://localhost:3000/kindred/create.git"
           if [ -d .git ]; then
             git fetch "$REPO_URL" main
             git checkout -f FETCH_HEAD
@@ -21,15 +21,6 @@ jobs:
             git clone --depth 1 --branch main "$REPO_URL" .
           fi
 
-      - name: Install mdBook
-        run: |
-          if ! command -v mdbook &>/dev/null; then
-            MDBOOK_VERSION="v0.5.2"
-            wget -q -O mdbook.tar.gz "https://github.com/rust-lang/mdBook/releases/download/${MDBOOK_VERSION}/mdbook-${MDBOOK_VERSION}-x86_64-unknown-linux-musl.tar.gz"
-            tar -xzf mdbook.tar.gz -C /usr/local/bin
-            rm mdbook.tar.gz
-          fi
-
       - name: Build mdBook
         run: mdbook build docs/