warn about pull requests containing icons

CONTRIBUTING.md

@@ -34,9 +34,10 @@ As of v3.2.0, Font Awesome's CSS, LESS, SCSS, and documentation are all powered
 
 ## Pull requests
 
+- At the moment we are not accepting pull requests containing icons
 - Submit all pull requests against the appropriate `*-wip` branch for easier merging
 - Any changes to the docs must be made to the Liquid templates in the `src` directory
-- CSS changes must be done in .less and .scss files first, never the compiled files
+- CSS changes must be done in .less and .scss files in the `src` directory first, never the compiled files
 - If modifying the .less and .scss files, always recompile and commit the compiled files
 - Try not to pollute your pull request with unintended changes--keep them simple and small
 - Try to share which browsers your code has been tested in before submitting a pull request

src/_includes/community/submitting-pull-requests.html

@@ -2,6 +2,7 @@
   <h2 class="page-header">Submitting Pull Requests</h2>
   Found a way to solve a bug in Font Awesome? Want to contribute new features? Here are a few things to remember:
   <ol>
+    <li>Please do not submit new icons.</li>
     <li>Please submit all pull requests against *-wip branches.</li>
     <li>All pull requests submitted against master will be sumarily closed and this guide referenced.</li>
     <li>