[css-timing] Remove Repository and Issue Tracking lines that aren't overriding the defaults.

Author: dbaron

css-timing/Overview.bs

@@ -12,8 +12,6 @@ Editor: Brian Birtles 43194, Mozilla https://www.mozilla.org, bbirtles@mozilla.c
 Editor: Dean Jackson, Apple Inc https://www.apple.com/, dino@apple.com
 Editor: Matt Rakow, Microsoft
 Editor: Shane Stephens 47691, Google Inc, shans@google.com
-Repository: w3c/csswg-drafts
-!Issue Tracking: <a href="https://github.com/w3c/csswg-drafts/labels/css-timing-1">GitHub</a>
 
 Abstract: This CSS module describes a way for authors to define a transformation
     to be applied to the time of an animation. This can be used to produce