T283081: Add browserslist-config-wikimedia

[medied]

https://phabricator.wikimedia.org/T283081

What is the appropriate way to test this? Tested in Safari, Chrome and Firefox and no flags went up. This is what I get with npx browserslist

wikipedia-preview % npx browserslist
android 91
android 4.4.3-4.4.4
android 4.4
android 4.2-4.3
chrome 91
chrome 90
edge 91
edge 90
firefox 90
firefox 89
ie 11
ios_saf 14.5-14.7
ios_saf 14.0-14.4
ios_saf 13.4-13.7
ios_saf 13.3
ios_saf 13.2
ios_saf 13.0-13.1
ios_saf 12.2-12.4
ios_saf 12.0-12.1
ios_saf 11.3-11.4
ios_saf 11.0-11.2
ios_saf 10.3
ios_saf 10.0-10.2
ios_saf 9.3
ios_saf 9.0-9.2
opera 77
opera 76
safari 14.1
safari 14
safari 13.1
safari 13
safari 12.1
safari 12
safari 11.1
safari 11
safari 10.1
safari 10
safari 9.1
(node:16357) ExperimentalWarning: Conditional exports is an experimental feature. This feature could change at any time

Note this would be for the modern/grade A row: https://www.mediawiki.org/wiki/Compatibility#Browser_support_matrix

[hueitan]

Looks good,

question came up in package-lock file, i think we should keep lockfileVersion 2?
https://docs.npmjs.com/cli/v7/configuring-npm/package-lock-json#lockfileversion

[medied]

Okay good call, updated package-lock.json