Restructure documentation

The big plan in motion, see https://gitlab.com/gitlab-org/gitlab-ce/issues/3349

Restructure documentation
The big plan in motion, see https://gitlab.com/gitlab-org/gitlab-ce/issues/3349
24ad2f4f · Achilleas Pipinellis · 0d287b06 · 24ad2f4f · 24ad2f4f · 24ad2f4f
--- a/doc/customization/branded_login_page.md
+++ b/doc/customization/branded_login_page.md
--- a/doc/customization/branded_login_page/appearance.png
+++ b/doc/customization/branded_login_page/appearance.png
--- a/doc/customization/branded_login_page/custom_sign_in.png
+++ b/doc/customization/branded_login_page/custom_sign_in.png
--- a/doc/customization/branded_login_page/default_login_page.png
+++ b/doc/customization/branded_login_page/default_login_page.png
--- a/doc/customization/issue_closing.md
+++ b/doc/customization/issue_closing.md
--- a/doc/customization/libravatar.md
+++ b/doc/customization/libravatar.md
--- a/doc/customization/welcome_message.md
+++ b/doc/customization/welcome_message.md
--- a/doc/downgrade_ee_to_ce/README.md
+++ b/doc/downgrade_ee_to_ce/README.md
--- a/doc/hooks/custom_hooks.md
+++ b/doc/hooks/custom_hooks.md
--- a/doc/incoming_email/README.md
+++ b/doc/incoming_email/README.md
--- a/doc/incoming_email/postfix.md
+++ b/doc/incoming_email/postfix.md
--- a/doc/integration/README.md
+++ b/doc/integration/README.md
--- a/doc/integration/akismet.md
+++ b/doc/integration/akismet.md
--- a/doc/integration/auth0.md
+++ b/doc/integration/auth0.md
--- a/doc/integration/azure.md
+++ b/doc/integration/azure.md
--- a/doc/integration/bitbucket.md
+++ b/doc/integration/bitbucket.md
--- a/doc/integration/cas.md
+++ b/doc/integration/cas.md
--- a/doc/integration/crowd.md
+++ b/doc/integration/crowd.md
--- a/doc/integration/external-issue-tracker.md
+++ b/doc/integration/external-issue-tracker.md
--- a/doc/integration/facebook.md
+++ b/doc/integration/facebook.md