Docs: replace htaccess.md with link (fix #1344)

Remove `htaccess.md` and link to the Apache `README.md` in
the `server-configs` repository as the documentation for the
configurations is now officially maintained in that repository.

doc/TOC.md

@@ -12,8 +12,9 @@
 * [HTML](html.md) — A guide to the default HTML.
 * [CSS](css.md) — A guide to the default CSS.
 * [JavaScript](js.md) — A guide to the default JavaScript.
-* [.htaccess](htaccess.md) — All about the Apache web server config (also see
-  our [alternative server configs](https://github.com/h5bp/server-configs)).
+* [.htaccess](https://github.com/h5bp/server-configs/blob/master/apache/README.md)
+  — All about the Apache web server config (also see our
+  [alternative server configs](https://github.com/h5bp/server-configs)).
 * [crossdomain.xml](crossdomain.md) — An introduction to making use of
   crossdomain requests.
 * [Everything else](misc.md).
@@ -29,7 +30,7 @@ HTML5 Boilerplate has several related projects to help improve the performance
 of your site/app in various production environments.
 
 * [Server configs](https://github.com/h5bp/server-configs) — Configs for
-  non-Apache servers.
+  different servers.
 * [Node build script](https://github.com/h5bp/node-build-script) — A
   feature-rich [grunt](https://github.com/gruntjs/grunt) plugin.
 * [Ant build script](https://github.com/h5bp/ant-build-script) — The original