Docs Upgrade

[danpastori]

What This PR Does

Fixes a number of issues assigned to me within the v3.0 release.

This PR Resolves

• https://github.com/serversideup/docker-php/issues/238
• https://github.com/serversideup/docker-php/issues/241
• https://github.com/serversideup/docker-php/issues/244
• https://github.com/serversideup/docker-php/issues/131
• https://github.com/serversideup/docker-php/issues/247
• https://github.com/serversideup/docker-php/issues/248
• https://github.com/serversideup/docker-php/issues/239
• https://github.com/serversideup/docker-php/issues/246

[danpastori]

@jaydrogers This PR is ready for review. The failing builds I don't understand. I ran it locally, everything compiled and built successfully. Could it be because it's a branch of a branch and the static site deploy is getting confused?