Use h2 for subheadings on main about page

one h1 seems sufficient
Change 'about-resources' to 'about' for consistency

I think 'about-resources' used to be one page,
but other pages used it as a template, so now most pages have this class,
and only the main page doesn't...
so just use consistent style across all the about pages and be done with it.
Move "anchors" (bookmark) style to separate less file

Since it has nothing to do with pod (and isn't limited to those pages).
Also remove some unneeded style and add some comments.
Indent about headings more consistently

and space them better when surrounded by just text.
Use relative units to resize fonts

instead of hard-coding arbitrary sizes.