Add type to frontmatter

doc/security/README.md

 ---
 comments: false
+type: index
 ---
 
 # Security

doc/security/crime_vulnerability.md

+---
+type: reference
+---
+
 # How we manage the TLS protocol CRIME vulnerability
 
 > CRIME ("Compression Ratio Info-leak Made Easy") is a security exploit against
@@ -7,7 +11,7 @@ authentication cookies, it allows an attacker to perform session hijacking on an
 authenticated web session, allowing the launching of further attacks.
 ([CRIME](https://en.wikipedia.org/w/index.php?title=CRIME&oldid=692423806))
 
-### Description
+## Description
 
 The TLS Protocol CRIME Vulnerability affects compression over HTTPS, therefore
 it warns against using SSL Compression (for example gzip) or SPDY which
@@ -24,7 +28,7 @@ Although SPDY is enabled in Omnibus installations, CRIME relies on compression
 (the 'C') and the default compression level in NGINX's SPDY module is 0
 (no compression).
 
-### Nessus
+## Nessus
 
 The Nessus scanner, [reports a possible CRIME vulnerability][nessus] in GitLab
 similar to the following format:
@@ -50,7 +54,7 @@ attack nor does it check if compression is enabled. With just this approach, it
 cannot tell that SPDY's compression is disabled and not subject to the CRIME
 vulnerability.
 
-### References
+## References
 
 - Nginx ["Module ngx_http_spdy_module"][ngx-spdy]
 - Tenable Network Security, Inc. ["Transport Layer Security (TLS) Protocol CRIME Vulnerability"][nessus]

doc/security/information_exclusivity.md

+---
+type: concepts
+---
+
 # Information exclusivity
 
 Git is a distributed version control system (DVCS).
@@ -6,4 +10,4 @@ In GitLab every project member that is not a guest (so reporters, developers and
 After obtaining this local copy the user can upload the full repository anywhere, including another project under their control or another server.
 The consequence is that you can't build access controls that prevent the intentional sharing of source code by users that have access to the source code.
 This is an inherent feature of a DVCS and all git management systems have this limitation.
-Obviously you can take steps to prevent unintentional sharing and information destruction, this is why only some people are allowed to invite others and nobody can force push a protected branch.
+Obviously you can take steps to prevent unintentional sharing and information destruction, this is why only some people are allowed to invite others and nobody can force push a protected branch.
\ No newline at end of file

doc/security/password_length_limits.md

+---
+type: reference, howto
+---
+
 # Custom password length limits
 
 If you want to enforce longer user passwords you can create an extra Devise initializer with the steps below.