[gimp-web] Add GIMP GUI mailinglist

[Jehan <jehanp src gnome org>]

commit 4614705b95834e3bde4a6657a5665d05c8443602
Author: nmat <15926-nmat users noreply gitlab gnome org>
Date:   Wed Mar 20 23:26:51 2019 +0100

    Add GIMP GUI mailinglist
    
    * Fixes #96

 content/develop/index.md | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)
---
diff --git a/content/develop/index.md b/content/develop/index.md
index 71126b82..4965394f 100644
--- a/content/develop/index.md
+++ b/content/develop/index.md
@@ -72,6 +72,7 @@ New contributors should first introduce themselves on IRC (the #gimp channel at
 
 *   [GIMP Developers mailing list, for those who work on the core GIMP application and 
plugins](https://mail.gnome.org/mailman/listinfo/gimp-developer-list)
 *   [GEGL Developers mailing list for developers of the GEGL 
library](https://mail.gnome.org/mailman/listinfo/gegl-developer-list)
+*   [GIMP GUI Developers mailing list, for working on GIMP 
GUI](https://mail.gnome.org/mailman/listinfo/gimp-gui-list)
 *   [GIMP Web Developers mailing list, for working on this 
website](https://mail.gnome.org/mailman/listinfo/gimp-web-list)
 *   [GIMP Documentation mailing list, for working on the user 
manual](https://mail.gnome.org/mailman/listinfo/gimp-docs-list)
 
@@ -83,21 +84,21 @@ GIMP has a complex code base, and newcomers that might not be sure where to star
 
 The site you should keep updated with and the site that is updated all the time with new development help 
guides is located at <https://wiki.gimp.org/>. If you have GIMP installed at the moment then there are some 
files you should look at in the source code that might help you a little.
 
-*   [INSTALL](https://gitlab.gnome.org/GNOME/gimp/blob/master/INSTALL.in)  
+*   [INSTALL](https://gitlab.gnome.org/GNOME/gimp/blob/master/INSTALL.in)
      _(Contains most up-to-date information on building GIMP from source code)_
-*   [HACKING](https://gitlab.gnome.org/GNOME/gimp/blob/master/HACKING)  
+*   [HACKING](https://gitlab.gnome.org/GNOME/gimp/blob/master/HACKING)
      _(Contains a lot of information that you need to know if you want to start coding)_
-*   [README](https://gitlab.gnome.org/GNOME/gimp/blob/master/README)  
+*   [README](https://gitlab.gnome.org/GNOME/gimp/blob/master/README)
      _(The main README for GIMP which should be read by everyone)_
-*   [README.i18n](https://gitlab.gnome.org/GNOME/gimp/blob/master/README.i18n)  
+*   [README.i18n](https://gitlab.gnome.org/GNOME/gimp/blob/master/README.i18n)
      _(The internationalization README which should be read by translators)_
 
 Once you've figured out what to do, though, be bold and get to work!
 
 ## How To Submit Your Changes
 
-When you're ready, make your edits and [generate a patch file](https://git-scm.com/docs/git-format-patch).  
-Send the patch file, along with a summary of what you did to a bug/enhancement request on the 
[bugtracker](https://gitlab.gnome.org/GNOME/gimp/issues) or to the mailing list. 
+When you're ready, make your edits and [generate a patch file](https://git-scm.com/docs/git-format-patch).
+Send the patch file, along with a summary of what you did to a bug/enhancement request on the 
[bugtracker](https://gitlab.gnome.org/GNOME/gimp/issues) or to the mailing list.
 
 The GIMP community is a friendly one, but it probably is still worth saying this: Try not to take critiques 
personally. We all just want GIMP to be the best that it can be. Once approved, your edits will be merged 
into the code base, making you an official GIMP contributor. And if you keep up the good work, not only will 
this process get easier with practice, your administrative privileges in GIMP development will also increase 
too.
 
@@ -115,16 +116,16 @@ The GIMP community is a friendly one, but it probably is still worth saying this
 
 ## <a name="development"></a>GIMP Development Links
 
-[GIMP developers](http://wiki.gimp.org)  
+[GIMP developers](http://wiki.gimp.org)
  The main GIMP development website
 
-[GEGL](http://www.gegl.org/)  
+[GEGL](http://www.gegl.org/)
  An image processing library based on GObjects
 
 [babl](http://gegl.org/babl/)
  A dynamic, any to any, pixel format translation library
 
-[GNOME GIT](https://gitlab.gnome.org/)  
+[GNOME GIT](https://gitlab.gnome.org/)
  GNOME GIT source code repository
 
 ## Latest Changes in Code