refactor: move test/ and yarn to repo root

Also lint and format entire repo, beyond just wowchemy/ dir

URL encode `(` and `)` in `[#MadeWithWowchemy](...(..)...)` in Readme.md for Prettier

.github/workflows/build-test-site.yaml

@@ -4,13 +4,9 @@ on:
   push:
     branches:
       - master
-    paths:
-      - 'wowchemy/**'
   pull_request:
     branches:
       - master
-    paths:
-      - 'wowchemy/**'
 
 jobs:
   build:
@@ -34,11 +30,9 @@ jobs:
 
       - name: Install JS dependencies
         run: rm -rf node_modules && yarn install --frozen-lockfile
-        working-directory: ./wowchemy
 
       - name: Check for linting errors
         run: yarn run lint
-        working-directory: ./wowchemy
 
 #  format:
 #    runs-on: ubuntu-latest
@@ -75,4 +69,4 @@ jobs:
 
       - name: Build
         run: hugo --minify
-        working-directory: ./wowchemy/test
+        working-directory: test