This makes all pages look and feel the same, because they all use the
default CSS generated by pandoc. Also, it inserts the banner everywhere
at the top, not only into the top-level index.html.
Credit to @xSlendiX for suggesting that `-B` works here.
Index page:
- Change links from "Man 1" to "Section 1"
Section index pages:
- Change title from "1" to "Section 1 - SerenityOS man pages"
- Change links from "foo" to "foo(1)"
Man pages:
- Change title from "foo" to "foo(1) - SerenityOS man pages"
