replace link to XVilka's gist with the updated one
To ease collaboration,  XVilka has decided to relocate  their gist to an
actual Github repository  a while ago,  in oder to facilitate  contribu-
tions.
Ref: ff.
@@ -487,7 +487,7 @@ Use the `navigate` feature to activate navigation keybindings. In this mode, pre
### 24 bit color (truecolor)
-Delta looks best if your terminal application supports 24 bit colors. See https://gist.github.com/XVilka/8346728. For example, on MacOS, iTerm2 supports 24-bit colors but Terminal.app does not.
+Delta looks best if your terminal application supports 24 bit colors. See https://github.com/termstandard/colors#readme. For example, on MacOS, iTerm2 supports 24-bit colors but Terminal.app does not.
If your terminal application does not support 24-bit color, delta will still work, by automatically choosing the closest color from those available. See the `Colors` section of the help output below.
