Create anchors to link to specific lines of code

[SamWilsn]

For example https://ethereum.github.io/execution-specs/src/ethereum/berlin/fork.py.html#L637 to link to:

Might need to be creative to avoid name clashes though.

[omegajudith]

Please Asign

[SamWilsn]

We don't assign issues to outside contributors, but feel free to work on this if you'd like!

[Anuoluwapo25]

@omegajudith Are you working on this?

[omegajudith]

Hey. No am not