ESP3D-WEBUI 3.0

using Preact per @aganov suggestion
Rewrite per @alxblog suggestion to use proper Preactjs API and lighter code: use spectre.css instead of bootstrap 4.x

In development / pre-alpha stage - NOT ready to test...

Only compatible with ESP3DLib v2 - which will be merged to ESP3D 3.0 later

Latest development version

Setup development tools

1 - Install current nodejs LTS (currently using v14.16.1)

node -v
v14.16.1

npm -v
6.14.12

2 - Download all necessary packages in ESP3D-WEBUI directory (repository root)

npm install

Start dev server

in ESP3D-WEBUI directory (repository root)

npm run dev

will open http://localhost:8088

Back end query server is localhost:8080, websocket server is localhost:81

Build index.html.gz to /dist folder

in ESP3D-WEBUI directory (repository root)

npm run build

Will generate production version

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