Move the old site to another repo (#5739)

* Delete the old site from this repo

* Remove old GH workflow

* Remove other files

.github/workflows/nodejs.yml

@@ -1,27 +0,0 @@
-name: Lint / Flow check
-
-on:
-  push:
-    branches:
-      - main # change this if your default branch is named differently
-  pull_request:
-    types: [opened, synchronize, reopened]
-
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-
-    name: Lint on node 12.x and ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v1
-      - name: Use Node.js 12.x
-        uses: actions/setup-node@v1
-        with:
-          node-version: 12.x
-
-      - name: Install deps and build (with cache)
-        uses: bahmutov/npm-install@v1.7.10
-
-      - name: Lint codebase
-        run: yarn ci-check