Rephrasing contribution guide; removing CompCert due to notable non-freedom

CONTRIBUTING.md

@@ -5,19 +5,28 @@ alone, and I welcome pull requests. To make sure that we're all on the same
 page, here are some guidelines to follow for submitting pull requests for this
 list.
 
-## Ensure that everything you link to is free (as in freedom) ##
+## What would be great ##
+
+Obviously, it's your choice what you want to contribute - or not
+contribute. However, if you're looking for something that would help awesome-c,
+check the current issues, especially those tagged with 'help wanted'. Pull
+requests addressing these are particularly great!
+
+## How to contribute ##
+
+Now for the mechanics of the process, and some do's and don't's.
+
+### Ensure that everything you link to is free (as in freedom) ###
 
 This is highly important - this list *only* contains freedom-respecting things!
 If you are sending a pull request linking to code, ensure it is licensed under a
-[freedom-respecting license][1]; if you are linking to assets of any kind, make
-sure that [they are the same][2]. For games, be especially careful that they are
-both.
+[freedom-respecting license][1].
 
-## Indicate the license for anything you add clearly ##
+### Indicate the license for anything you add clearly ###
 
-Ensure that you use the correct name for the license (as per [this][1]
-or [this][2]), and indicate any further restrictions clearly. Also check if the
-license is in use already - if it is, don't create another link to it.
+Ensure that you use the correct name for the license (as per [this][1]), and
+indicate any further restrictions clearly. Also check if the license is in use
+already - if it is, don't create another link to it.
 
 ## Maintain alphabetical order within sections ##
 

README.md

@@ -80,8 +80,6 @@ These are tools to automate the building and testing of projects in C.
 ## Compilers ##
 
 * [Clang][38] - A compiler for LLVM. Supports C11. [NCSA][39].
-* [CompCert][269] - A fully-verified compiler. Supports almost all of
-  C89. [GNU GPLv2.1][8] or later.
 * [GCC][40] - Provides a C compiler as part of its compiler set. Supports
   C11. [GNU GPLv3][41] or later.
 * [PCC][74] - A venerable compiler. Supports C99. [Various licenses][75], all free.
@@ -1073,7 +1071,7 @@ with respect to support for C.
 [266]: https://www.securecoding.cert.org/confluence/display/c/SEI+CERT+C+Coding+Standard
 [267]: http://blog.pkh.me/p/20-templating-in-c.html
 [268]: http://lipforge.ens-lyon.fr/www/crlibm/index.html
-[269]: https://github.com/AbsInt/CompCert
+
 [270]: https://github.com/docopt/docopt.c
 [271]: http://marek.vavrusa.com/c/memory/2015/02/20/memory/
 [272]: http://kukuruku.co/hub/programming/i-do-not-know-c