Intro adjustments proposal

[lhsazevedo]

Hey there!

After some local experiments, I would like to propose some tweaks to the intro element of the home page, also known as hero. There are still some adjustments to be done for mobile devices, which I will do if this proposal is well accepted by the community, followed by a PR.

The goal was to use size, color, white space and call to actions to guide new visitors who might be a little confused by visual clutter. The change also empowers the PHP branding by adding a large logo above the lead, which now has a larger font and an emphasis on the "popular general-purpose scripting language" snippet.

Animated comparison:

[adielcristo]

Thanks for the proposal! I suggest changing the "Changes" link to "Changelog", as it is a more common term (my opinion, I don't have figures/sources for that).