Improve overal codebase, use modern tech like esbuild and TypeScript 4! (#1055)

* use esbuild for React instead of tsdx

* remove tsdx from Vue

* use consistent names

* add jest and prettier

* update scripts

* ignore some folders for prettier

* run lint script instead of tsdx lint

* run prettier en-masse

This has a few changes because of the new prettier version.

* bump typescript to latest version

* make typescript happy

* cleanup playground package.json

* make esbuild a dev dependency

* make scripts consistent

* fix husky hooks

* add dedicated watch script

* add `yarn playground-react` and `yarn react-playground` (alias)

This will make sure to run a watcher for the actual @headlessui/react
package, and start a development server in the playground-react package.

* ignore formatting in the .next folder

* run prettier on playground-react package

* setup playground-vue

Still not 100% working, but getting there!

* add playground aliases in @headlessui/vue and @headlessui/react

This allows you to run `yarn react playground` or `yarn vue playground`
from the root.

* add `clean` script

* move examples folder in playground-vue to root

* ensure new lines for consistency in scripts

* fix typescript issue

* fix typescript issues in playgrounds

* make sure to run prettier on everything it can

* run prettier on all files

* improve error output

If you minify the code, then it could happen that the errors are a bit
obscure. This will hardcode the component name to improve errors.

* add the `prettier-plugin-tailwindcss` plugin, party!

* update changelog

.github/CONTRIBUTING.md

@@ -46,4 +46,3 @@ yarn vue test
 ```
 
 Please ensure that the tests are passing when submitting a pull request. If you're adding new features to Headless UI, please include tests.
-

.github/ISSUE_TEMPLATE/config.yml

@@ -12,4 +12,3 @@ contact_links:
   - name: Documentation Issue
     url: https://github.com/tailwindlabs/headlessui/issues/new?title=%5BDOCS%5D:%20
     about: 'For documentation issues, suggest changes on our documentation repository.'
-

.github/workflows/release-insiders.yml

@@ -44,7 +44,7 @@ jobs:
         id: vars
         run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
 
-      - name: "Version based on commit: 0.0.0-insiders.${{ steps.vars.outputs.sha_short }}"
+      - name: 'Version based on commit: 0.0.0-insiders.${{ steps.vars.outputs.sha_short }}'
         run: npm version -w packages 0.0.0-insiders.${{ steps.vars.outputs.sha_short }} --force --no-git-tag-version
 
       - name: Publish
@@ -52,4 +52,3 @@ jobs:
         env:
           CI: true
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
-