epub converter: bug fix

- remove adding border 0 in td
-save links while headings removal

src/util/color_reader.py

@@ -59,9 +59,7 @@ def str2color_name(s: str):
     elif '#' in s:
         name = get_hex_color_name(s)
         if (name == 'white') and (s.lower() not in ['#ffffff', '#fff']):
-            return 'gray'
-        if name == 'grey':
-            return 'gray'
+            name = 'gray'
 
         return name