remove usage-docs from workflows

.github/workflows/publish-docs.yml

@@ -18,26 +18,6 @@ jobs:
           # if this changes, change it in cli/Cargo.toml and .github/workflows/publish-docs.yml as well
           mdbook-version: '0.4.10'
 
-      - name: Cache cargo registry
-        uses: actions/cache@v2
-        with:
-          path: ~/.cargo/registry
-          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
-
-      - name: Cache cargo build
-        uses: actions/cache@v2
-        with:
-          path: target
-          key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
-
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
-
-      - name: Create usage-docs plugin
-        run: cargo build -p taskchampion-cli --features usage-docs --bin usage-docs
-
       - run: mdbook build docs
 
       - name: Deploy