[JordanMarr]

Updates the docs and README for the 2.0 release (see #90).

Docs site

• Getting started: Fable 5, Lit 3 (Lit 2 also works) and Elmish 5. Install with dotnet add package and npm install lit, with Femto as an option. Points to fable-lit-fullstack-template, and notes that Lit.TodoMVC was written for Fable 3.
• Testing: a warning that Fable.Lit.Test isn't released for Fable 5 yet, because it's waiting on Fable.Expect.
• Hot reloading: removes Snowpack. Notes that Elmish HMR hasn't been tested with Fable.Lit.Elmish 2.
• Templates: drops the outdated claim that Lit.Elmish includes HMR, which was removed in 1.4.0.
• nacara.config.json: the site URL, edit links and GitHub link now point at fable-hub.

README

• NuGet badges, a link to the docs, and a status table for each package.
• Explains that the docs toolchain needs Node 14.

Publish workflow

• Deploys again on pushes to main that touch docsrc/ or nacara.config.json, and can still be run by hand.
• Updated to current actions. Uses setup-dotnet with global.json, because npm install runs dotnet tool restore.
• Stays on Node 14. Nacara 1.0 beta fails on Node 16+, because fs.rmdir(..., { recursive: true }) throws for missing folders there.

Tested locally: the site builds with Node 14 (npx -y node@14 node_modules/nacara/cli.js), and npm install succeeds on Node 14. The workflow itself hasn't run yet. It will run when this PR is merged, and deploy to gh-pages.

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