Clean up CSS and improve readability

Changes in this MR

1. Ensure we write markdown files as html. This solves the case of missing index.html file
2. Add headings to individual pages, based on their title
3. Link MR titles to their web URLs
4. Clean up CSS and improve readability
   1. Use classes instead of ids as CSS selectors
   2. Use lighter colors to increase readability
   3. Add hover effect to increase readability
   4. Make table center aligned horizontally
   5. Remove unused CSS rules

In my machine, the results are as follows

Before	After