chore(v2): adjust website npm package

[lex111]

Motivation

• Use defaults setting for Browserlist (0.5% instead of 0.2%). This will avoid transforming CSS vars to static representation, as the support for this feature is pretty good https://caniuse.com/css-variables

• Adding missing command to clean the build in npm scripts

• Relevant documentation updates

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Preview.

Related PRs

(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)

[netlify]

Deploy preview for docusaurus-2 ready!

Built with commit d330542

https://deploy-preview-3709--docusaurus-2.netlify.app

[slorber]

LGTM thanks

[slorber]

Does this mean that the site won't work anymore on IE11?
That may not be a good idea even if it's in end of life?

Not sure but as the user is able to modify this himself that is probably fine anyway

[lex111]

Does this mean that the site won't work anymore on IE11?

Yes, but we have officially stated that we do not support this old browser:

Even now, site for v2 is not very well displayed and works in IE11, given global share of this browser, the point to maintain it at the CSS level is extremely small.

Moreover, we do not see a request from users in this. There is an interesting article concerning the end of life of IE11 https://www.swyx.io/ie11-eol/. So in a sense, IE11 is already dead.

[slorber]

Yes was refering to this article for IE11 end of life 👍
Let's merge and see if someone complains