GitLab Pages admin guide clean up [ci skip]
GitLab Pages admin guide clean up [ci skip]

- Fix markdown
- Remove how it works section, maybe add it at a later point

jirutka/gitlabhq,darkrasid/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,htve/GitlabForChinese,dreampet/gitlab,stoplightio/gitlabhq,dreampet/gitlab,htve/GitlabForChinese,t-zuehlsdorff/gitlabhq,stoplightio/gitlabhq,dplarson/gitlabhq,LUMC/gitlabhq,iiet/iiet-git,LUMC/gitlabhq,darkrasid/gitlabhq,t-zuehlsdorff/gitlabhq,openwide-java/gitlabhq,darkrasid/gitlabhq,openwide-java/gitlabhq,LUMC/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,mmkassem/gitlabhq,openwide-java/gitlabhq,axilleas/gitlabhq,darkrasid/gitlabhq,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,openwide-java/gitlabhq,dreampet/gitlab,LUMC/gitlabhq,mmkassem/gitlabhq,dplarson/gitlabhq,dplarson/gitlabhq,jirutka/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,dplarson/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,htve/GitlabForChinese,iiet/iiet-git,htve/GitlabForChinese