Fix header offset with jump links

[kyriediculous]

Describe the bug (required) A clear and concise description of what the bug
is.

When linking to a specific subheader on the docs the header for the section you link to actually disappears behind the nav , would it be possible to introduce an offset here so that the subheader of the section you link to still shows? e.g. https://livepeer.org/docs/installation/install-livepeer#install-a-binary-release

Expected behavior (required) A clear and concise description of what you
expected to happen.

Still show the header.

https://css-tricks.com/fixed-headers-and-jump-links-the-solution-is-scroll-margin-top/

[adamsoffer]

@kyriediculous I'm going to transfer this to the livepeer-org repo...