feat: allow users to pass ring_color param (#2075)

* fix: prevent crash if undefined color is passed to func fallbackColor

* feat: allow users to pass ring_color param

Before this commit, the ring color was always equal to the title color.
This commit allows the user to pass a ring_color property to allow him
to style the ring color the way he pleases to. If no ring_color is
passed we default to the title color.

* docs: improves ring color documentation

* fix: improve code style

Co-authored-by: rickstaa <rick.staa@outlook.com>

api/index.js

@@ -26,6 +26,7 @@ export default async (req, res) => {
     include_all_commits,
     line_height,
     title_color,
+    ring_color,
     icon_color,
     text_color,
     text_bold,
@@ -76,6 +77,7 @@ export default async (req, res) => {
         include_all_commits: parseBoolean(include_all_commits),
         line_height,
         title_color,
+        ring_color,
         icon_color,
         text_color,
         text_bold: parseBoolean(text_bold),