Add colours for Awk and regular expression source (#5392)

Author: Alhadis

lib/linguist/languages.yml

@@ -431,6 +431,7 @@ Avro IDL:
   language_id: 785497837
 Awk:
   type: programming
+  color: "#c30e9b"
   extensions:
   - ".awk"
   - ".auk"
@@ -4881,6 +4882,7 @@ Redirect Rules:
   language_id: 1020148948
 Regular Expression:
   type: data
+  color: "#009a00"
   extensions:
   - ".regexp"
   - ".regex"