Re-organize some pages

Not adding internal redirects because these pages are so new.

docs/buildkit/index.md → docs/tools/buildkit.md

 # Buildkit
 
-[Buildkit](https://github.com/civicrm/civicrm-buildkit) is a collection of ~20 tools for developing and testing CiviCRM, the most important of which is [civibuild](/buildkit/civibuild.md).
+[Buildkit](https://github.com/civicrm/civicrm-buildkit) is a collection of ~20 tools for developing and testing CiviCRM, the most important of which is [civibuild](/tools/civibuild.md).
 
 Many of these tools are commonly used by web developers, so you may have already installed a few. Even so, it's generally easier to [install](/buildkit/setup) the full collection — installing each individually takes a lot of work.
 
@@ -46,7 +46,7 @@ You may install buildkit in other environments. The main pre-requisites are:
 * PHP 5.3+ (Extensions: `bcmath curl gd gettext imap intl imagick json mbstring mcrypt openssl pdo_mysql phar posix soap zip`)
 * NodeJS (v5 recommended)
 * NPM
-* Recommended (_for [amp](https://github.com/totten/amp) and [civibuild](/buildkit/civibuild.md)_)
+* Recommended (_for [amp](https://github.com/totten/amp) and [civibuild](/tools/civibuild.md)_)
     * Apache 2.2 or 2.4 (Modules: `mod_rewrite`. On SUSE, possibly `mod_access_compat`. This list may not be exhaustive.)
     * MySQL 5.1+ (client and server)
 

docs/tools/github.md

+# Using GitHub for CiviCRM development
+
+TODO: migrate content from
+
+https://wiki.civicrm.org/confluence/display/CRMDOC/Contributing+to+CiviCRM+using+GitHub

docs/tools/index.md

@@ -5,7 +5,7 @@
 All of these tools come bundled within [buildkit](/buildkit).
 
 * `civibuild` - Build a complete source tree (with CMS+Civi+addons), provision httpd/sql, etc.
-    * *[documentation](/buildkit/civibuild.md)*
+    * *[documentation](/tools/civibuild.md)*
     * *[repository](https://github.com/civicrm/civicrm-buildkit)*
 * `cv` - command is a utility for interacting with a CiviCRM installation
     * *documentation: run `cv list`*

mkdocs.yml

@@ -13,12 +13,12 @@ pages:
   - File System: basics/filesystem.md
 - Development tools:
   - Development tools: tools/index.md
+  - Buildkit: tools/buildkit.md
+  - civibuild: tools/civibuild.md
+  - cividist: tools/cividist.md
+  - GitHub: tools/github.md
   - PhpStorm: tools/phpstorm.md
   - Debugging: tools/debugging.md
-- Buildkit:
-  - Buildkit: buildkit/index.md
-  - civibuild: buildkit/civibuild.md
-  - cividist: buildkit/cividist.md
 - Core Development:
   - When to Edit Core: core/hacking.md
   - How to Contribute: core/contributing.md