Reformat config.md as markdown

The format of config.md was not rendered nicely as markdown.
Use pointed list to have the settings clearly visible and
formatted as markdown.

Change-Id: I9f1551c797ceca02374bfb82dcd8c1c6a58b91ee
diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index 2112afb..d74fc03 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -9,41 +9,31 @@
     type = identicon
 ```
 
-<a id="type">
-`plugin.@PLUGIN@.type`
-:	Avatar type in www.gravatar.com service.
+- `plugin.@PLUGIN@.type`: Avatar type in www.gravatar.com service.
 
 	Can be any type supported by the service
 	(404, mm, identicon, monsterid, wavatar, retro, robohash, blank, ...).
 
 	Default: identicon
 
-<a id="rating">
-`plugin.@PLUGIN@.rating`
-:	Avatar rating in www.gravatar.com service.
+- `plugin.@PLUGIN@.rating`: Avatar rating in www.gravatar.com service.
 
 	Can be any rating supported by the service
 	(g, pg, r, x, ...).
 
 	Default: pg
 
-<a id="gravatarUrl">
-`plugin.@PLUGIN@.gravatarUrl`
-:	URL that provides the Gravatar API.
+- `plugin.@PLUGIN@.gravatarUrl`: URL that provides the Gravatar API.
 
 	Uses provided protocol (http, https) or the same as gerrit.canonicalWebUrl.
 
 	Default: www.gravatar.com/avatar/
 
-<a id="changeAvatarUrl">
-`plugin.@PLUGIN@.changeAvatarUrl`
-:	Link to where the avatar can be changed as displayed in the profile settings.
+- `plugin.@PLUGIN@.changeAvatarUrl`: Link to where the avatar can be changed as displayed in the profile settings.
 
 	Default: http://www.gravatar.com
 
-<a id="defaultImage">
-`plugin.@PLUGIN@.defaultImage`
-:	Whether to have a default image placeholder when the account does not have
+- `plugin.@PLUGIN@.defaultImage`: Whether to have a default image placeholder when the account does not have
 	a default email.
 
 	Default: true