add index file to Pages docs

doc/pages/index.md

+# All you need to know about GitLab Pages
+
+## Product
+
+- [Product Webpage](https://pages.gitlab.io)
+- [We're Bringing GitLab Pages to CE](https://about.gitlab.com/2016/12/24/were-bringing-gitlab-pages-to-community-edition/)
+- [Pages Group - Templates](https://gitlab.com/pages)
+
+## Getting Started
+
+- Comprehensive Step-by-Step Guide: [Hosting on GitLab.com with GitLab Pages](https://about.gitlab.com/2016/04/07/gitlab-pages-setup/)
+- GitLab Pages from A to Z
+  - [Part 1: Static Sites, Domains, DNS Records, and SSL/TLS Certificates](https://gitlab.com/marcia/drafts/blob/master/pages/pages_part-1.md)
+  - [Part 2: Quick Start Guide - Setting Up GitLab Pages](https://gitlab.com/marcia/drafts/blob/master/pages/pages_part-2.md)
+      - Video tutorial: [How to Publish a Website with GitLab Pages on GitLab.com: from a forked project](#LINK)
+      - Video tutorial: [How to Publish a Website with GitLab Pages on GitLab.com: from scratch](#LINK)
+  - [Part 3: Creating and Tweaking `.gitlab-ci.yml` for GitLab Pages](#LINK)
+- Secure GitLab Pages Custom Domain with SSL/TLS Certificates
+  - [Let's Encrypt](https://about.gitlab.com/2016/04/11/tutorial-securing-your-gitlab-pages-with-tls-and-letsencrypt/)
+  - [CloudFlare](https://about.gitlab.com/2017/02/07/setting-up-gitlab-pages-with-cloudflare-certificates/)
+  - [StartSSL](https://about.gitlab.com/2016/06/24/secure-gitlab-pages-with-startssl/)
+- Static Site Generators - Blog Posts Series
+  - [SSGs Part 1: Static vs Dynamic Websites](https://about.gitlab.com/2016/06/03/ssg-overview-gitlab-pages-part-1-dynamic-x-static/)
+  - [SSGs Part 2: Modern Static Site Generators](https://about.gitlab.com/2016/06/10/ssg-overview-gitlab-pages-part-2/)
+  - [SSGs Part 3: Build any SSG site with GitLab Pages](https://about.gitlab.com/2016/06/17/ssg-overview-gitlab-pages-part-3-examples-ci/)
+- [Posting to your GitLab Pages blog from iOS](https://about.gitlab.com/2016/08/19/posting-to-your-gitlab-pages-blog-from-ios/)
+
+## Advanced Use
+
+- Blog Posts:
+  - [GitLab CI: Run jobs Sequentially, in Parallel, or Build a Custom Pipeline](https://about.gitlab.com/2016/07/29/the-basics-of-gitlab-ci/)
+  - [GitLab CI: Deployment & Environments](https://about.gitlab.com/2016/08/26/ci-deployment-and-environments/)
+  - [Building a new GitLab Docs site with Nanoc, GitLab CI, and GitLab Pages](https://about.gitlab.com/2016/12/07/building-a-new-gitlab-docs-site-with-nanoc-gitlab-ci-and-gitlab-pages/)
+  - [Publish Code Coverage Report with GitLab Pages](https://about.gitlab.com/2016/11/03/publish-code-coverage-report-with-gitlab-pages/)
+
+## General Documentation
+
+- [User docs](../user/project/pages/)
+- [Admin docs](administration.html)