fix: adjust config to support only active or used browsers

[susnux]

Refine configuration as v3.1.0 introduced a bunch of previously not supported old browsers that cause heavily increased bundle sizes. This instead goes back to what 3.0.1 had (>0.25% usage) but also includes new browsers (what 3.1.0 wanted to fix) that are not yet used by >0.25% of users.

So we support:

• Always Firefox ESR
• Browsers (and their forks like Edge) that support "baseline widely available"
  • If they are new (last 4 major versions)
  • Or still used by >0.25% of the market
  • And in both cases are not dead

[skjnldsv]

That moves back the audience coverage to below 90%, I'm not really ok with that

1. https://browsersl.ist/#q=defaults%2C+not+op_mini+all%2C+not+dead%2C+Firefox+ESR%2C+baseline+widely+available
2. https://browsersl.ist/#q=baseline+widely+available+with+downstream+and+last+4+major+versions+and+not+dead%2C+baseline+widely+available+with+downstream+and+%3E0.25%25+and+not+dead%2C+firefox+esr

Before: Audience coverage: 92.5 %
After: Audience coverage: 86.9 %

[susnux]

That moves back the audience coverage to below 90%, I'm not really ok with that

But hat was not was should have been changed with 3.1.0.
The problem was that even new browsers (modern safari) was not included, not that we exclude really old browsers.

So this list here is more closer to what we officially support, everything else is either already covered (but not listed because the website there is not that smart) or is just old or forces use to create gigantic bundles.
So this is just a fix to revert adding support for obscure browsers that do not support any modern API.

Summary: Revert to 3.0.1 state but add support for modern browsers.

[susnux]

For comparison:
Its technical similar to:
https://browsersl.ist/#q=baseline+widely+available+with+downstream+and+not+dead%0AFirefox+ESR

But instead of adding support for every browser in between with 0% usage we only add explicit support for:

• current browsers (4 major versions
• really used browsers (>0.25%)

So I do not think we loose any users, also we now support more browsers than with 3.0.1 which we used for 3 years :)

[susnux]

But if 90 is an important number, than I adjusted the config to be pretty much the same but also include versions in between so its now:

[skjnldsv]

You convinced me 👍