All dependabot suggestions on one MR (uber#811)

Bump `eventsource` from `1.0.7` to `1.1.1`: 
 - in /examples/overlays
 - in /examples/react-map-gl-draw
 - in /examples/no-map
 - in /examples/editor
 
Bump terser to `4.8.1`:
- from `4.4.2` /website
- from `4.6.6` /examples/overlays
- from `4.6.6` /examples/no-map
- from `4.6.6` /examples/sf
- from `4.6.7` /examples/editor
- from `4.6.7` /examples/editor
- from `4.6.10` in root
- from `4.6.12` in /examples/react-map-gl-draw

Bump async from `2.6.3` to `2.6.4`:
- in /examples/editor
- in /examples/editable-h3-cluster-layer


Bump jsdom from 9.12.0 to 16.5.0

Bump moment from 2.24.0 to 2.29.4 in /website
Bump css-what from 2.1.0 to 2.1.3 in /examples/sf
Bump eventsource in /examples/editable-h3-cluster-layer
Bump socket.io-parser from 3.3.0 to 3.3.2 in /website

remove unused files

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
closes uber#810, uber#806, uber#805, uber#804, uber#785, uber#784, uber#783, uber#782, uber#781, uber#780, uber#779, uber#776, uber#771, uber#766, uber#764, uber#763, uber#762, uber#761, uber#760