Please check out my Atlas - Help Center app here: https://apps.shopify.com/atlas-help-center
Some of the features are:
- SEO (truly indexable pages)
- Two themes that you can choose from
- The launcher is a "messenger like" widget that shows within all your store pages for quick access.
- Track customer satisfaction and visits for each article
There are other features that you might find useful: edit all the storefront labels, popular articles widget, recently viewed widget, custom CSS for both the store pages and the launcher, custom code (liquid is also possible, integrate with third-party services, for example, you can embed a Mailchimform), advanced editor (support for image upload, embedded videos).