Fixed contributor avatar links (#2126)

* Fixed contributor avatar links

Had to put them in qtresource format so those will actually display in Settings -> About.
Reference: https://doc.qt.io/qt-5/resources.html#compiled-in-resources

* Added my avatar and updated documentation

resources/contributors.txt

@@ -3,10 +3,14 @@
 # TODO: Parse this into a CONTRIBUTORS.md too
 
 # Adding yourself? Copy and paste this template at the bottom of this file and fill in the fields in a PR!
-# Name | Link | Avatar (Loaded as a resource) | Title (description of work done). Contributor is what we use for someone who has contributed in general (like sent a programming-related PR)
+# Name | Link | Avatar (Loaded as a resource) | Title (description of work done).
 
-fourtf | https://fourtf.com | avatars/fourtf.png | Author, main developer
-pajlada | https://pajlada.se | avatars/pajlada.png | Collaborator, co-developer
+# Avatar should be located in avatars/ directory. Its size should be 128x128 (get it from https://github.com/username.png?size=128).
+# Make sure to reduce avatar's size as much as possible with tool like pngcrush or optipng and run ./generate_resources.py
+# Contributor is what we use for someone who has contributed in general (like sent a programming-related PR)
+
+fourtf | https://fourtf.com | :/avatars/fourtf.png | Author, main developer
+pajlada | https://pajlada.se | :/avatars/pajlada.png | Collaborator, co-developer
 
 Cranken | https://github.com/Cranken | | Contributor
 hemirt | https://github.com/hemirt | | Contributor
@@ -32,8 +36,9 @@ Mm2PL | https://github.com/mm2pl | | Contributor
 gempir | https://github.com/gempir | | Contributor
 mfmarlow | https://github.com/mfmarlow | | Contributor
 dnsge | https://github.com/dnsge | | Contributor
-zneix | https://github.com/zneix | | Contributor
+zneix | https://github.com/zneix | :/avatars/zneix.png | Contributor
 y0dax | https://github.com/y0dax | | Contributor
+
 # If you are a contributor add yourself above this line
 
 Defman21 | https://github.com/Defman21 |  | Documentation

resources/resources_autogenerated.qrc

@@ -2,6 +2,7 @@
   <qresource prefix="/">
     <file>avatars/fourtf.png</file>
     <file>avatars/pajlada.png</file>
+    <file>avatars/zneix.png</file>
     <file>buttons/addSplit.png</file>
     <file>buttons/addSplitDark.png</file>
     <file>buttons/ban.png</file>