Yoga Docs: Delete the Old website (#1612)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1612

Moving new website to `/website` before publishing, so that edit links point to the right eventual place in the GitHub repo.

Reviewed By: joevilches

Differential Revision: D54837808

fbshipit-source-id: 46de8a638ad9bce18558fd768ed8c080892b828e

.github/workflows/validate-website.yml

@@ -10,22 +10,8 @@ on:
   workflow_dispatch:
 
 jobs:
-  build:
-    name: Build [Gatsby]
-    runs-on: ubuntu-20.04
-
-    steps:
-      - uses: actions/checkout@v3
-
-      - name: Setup
-        uses: ./.github/actions/setup-website
-
-      - name: yarn build
-        run: yarn build
-        working-directory: website
-
   build_next:
-    name: Build [Docusaurus]
+    name: Build
     runs-on: ubuntu-latest
 
     steps: