Add link to >=3.x slim builds on https://code.jquery.com/ homepage

[timmywil]

Right now, it shows:

jQuery Core 3.0.0 - uncompressed, minified

Perhaps we could do:

jQuery Core 3.0.0 - uncompressed, minified, slim

[mgol]

Slim has a minified version as well so it'd have to be: "uncompressed, minified, slim, slim minified". Does that sound good?

[timmywil]

👍