Improve GitLab Pages doc to serve as thorough/enticing feature overview.
Per the Q3 documentation OKR requirements, this will be one of the feature docs that we make "more enticing, replacing the need for their about.gitlab.com feature pages".
Feature page: https://about.gitlab.com/features/pages/
Doc page: https://docs.gitlab.com/ee/user/project/pages/
See the linked epic for a checklist, and update the description here with it.
Additional page-specific checklist:
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This news made me realize that we need to clarify our SSL capabilities for Pages and be sure to mention HTTPS and LetsEncrypt here. -
Get rid of the 2 links that are labeled "outdated"
Edited by Mike Lewis