Fix design and content in small screens

Created by: numeroteca

Some bugs and ideas to fix them:

• convert to one column in small screen, when there are multiple columns in desktop version.
• smaller font size in title.
• add deeper links to sections (like at the beginning of report links to sections). Is it possible to list automatically sub-pages?
• make it possible to have full width images and smaller caption in small screen.
• add back to index or beginning at the end of report.