fix: deprecate hardhat workflow

.github/workflows/hardhat.js.yml

@@ -1,80 +0,0 @@
-name: Smart contracts
-
-on:
-  pull_request:
-    branches:
-      - "**"
-
-defaults:
-  run:
-    working-directory: contracts/
-
-jobs:
-  test:
-    name: ✅ Test
-    runs-on: ubuntu-latest
-    env:
-      PRIVATE_KEY: ${{ secrets.PRIVATE_KEY }}
-      POLYGON_ALCHEMY_KEY: ${{ secrets.POLYGON_ALCHEMY_KEY }}
-      ETH_ALCHEMY_KEY: ${{ secrets.ETH_ALCHEMY_KEY }}
-    steps:
-      - name: 🛑 Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.11.0
-
-      - name: ⬇️ Checkout repo
-        uses: actions/checkout@v3
-
-      - name: ⎔ Setup node ${{ matrix.node-version }}
-        uses: actions/setup-node@v3
-        with:
-          node-version: ${{ matrix.node-version }}
-
-      - name: 🐢 Cache node modules
-        id: cache-npm
-        uses: actions/cache@v3
-        env:
-          cache-name: cache-node-modules
-        with:
-          # npm cache files are stored in `~/.npm` on Linux/macOS
-          path: ~/.npm
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
-
-      - if: ${{ steps.cache-npm.outputs.cache-hit != 'true' }}
-        name: 📚 List the state of node modules
-        continue-on-error: true
-        run: npm list
-
-      - name: 📥 Download deps
-        run: npm install
-
-      - name: 🤔 Run smart contract tests
-        run: MINING=true CI=true npx hardhat test
-
-      - name: 🏗️ Save build
-        uses: stefanzweifel/git-auto-commit-action@v4
-        with:
-          commit_message: "fix: gas report"
-  audit:
-    name: 👁️ Audit
-    runs-on: ubuntu-latest
-    steps:
-      - name: 🛑 Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.11.0
-
-      - name: ⬇️ Checkout repo
-        uses: actions/checkout@v3
-
-      - name: 📥 Download deps
-        run: cd build && git clone https://github.com/byterocket/c4udit && cd c4udit && go build .
-
-      - name: 😡 Run contract auditor
-        run: cd build && ./c4udit/c4udit -s ../contracts/
-
-      - name: 🏗️ Save build
-        uses: stefanzweifel/git-auto-commit-action@v4
-        with:
-          commit_message: "fix: contract audit"