Updated some regexes for markdown coloring

config/ccat.colors

@@ -5,3 +5,4 @@
 PINK: 38 244 211 244 22
 BOLD_WHITE: 38 -1 -1 -1 1
 ITALIC_WHITE: 38 -1 -1 -1 3
+UNDERLINE_WHITE: 38 -1 -1 -1 4

config/md.conf

@@ -1,7 +1,13 @@
 # Priority decreases going downward ie. If two regexes match the same piece of
 # text, the one defined earlier will take precedence over the one defined later.
 # Headings
-'##?#?#?#?#?.*': MAGENTA
+'^#{1,6}.*?$': MAGENTA
+
+# Link text
+'\[.*?\](?=\(.*?\))': UNDERLINE_WHITE
+
+# Link URL
+'https?://\w+\.\w+.*?(?=\))': RED
 
 # Code blocks
 '```(.|\n)+?```': YELLOW