Cleaned up some trailing white space(s)

- Walked through the NEWS, README, and about org-pages and removed some
  white spaces that where sticking around.
- 🤘

mu4e/mu4e-about.org

@@ -4,7 +4,7 @@
   written & designed by /Dirk-Jan C. Binnema/, with contributions from others.
 
   *mu4e* and *mu* are free software, licensed under the terms of the [[http://www.gnu.org/licenses/gpl-3.0.html][GNU GPLv3]].
-  
+
   You can get the code from [[https://github.com/djcb/mu][the git repository]]; there, you can also [[https://github.com/djcb/mu/issues][file bugs
   and feature requests]].
 
@@ -12,4 +12,3 @@
    there's also the [[http://groups.google.com/group/mu-discuss][mu mailing list]].
 
    [Press *q* to quit this buffer]
-