Change description for Evan's theme to something neutral (#6304)

themes/evan.zsh-theme

@@ -1,2 +1,2 @@
-# Evan describes this sexy prompt as: "a skinny, topless prompt"
-PROMPT='%m :: %2~ %B»%b '
+# Evan's minimal prompt
+PROMPT='%m :: %2~ %B»%b '