@v2 release fixes

[alekseykulikov]

Goal: simplify docs and project structure to make it easier to get started
Tasks:

• simplify TS setup, since many deps has been removed
• fix multiple URLs action
• docs: use @v2 tag
• use upload.token and upload.serverBaseUrl
• docs: improve first example and move env vars to recipes section
• docs: combine serverBaseUrl and token (possible need a better name) for private server example
• docs: wrap recipes with details
• finish docs & check grammar
• publish release to marketplace https://github.com/treosh/lighthouse-ci-action/releases

Next: #11

[alekseykulikov]

@exterkamp I did my best with docs and v2 preparation. Let's use #11 for the next work or new PRs. Github Actions allow moving @v2 tag, so the release is not attached to one commit.

[exterkamp]

@exterkamp I did my best with docs and v2 preparation. Let's use #11 for the next work or new PRs. Github Actions allow moving @v2 tag, so the release is not attached to one commit.

sgtm 😄, looks great!

those <detail> sections are on point 💯