[ISSUE-227] add docs CLI command

[jameskim0987]

Description
Implemented docs CLI command for displaying the 3 available documentation page as clickable links.

Tests
Manual testing. Output:

$ ./main docs
Here are the available documentation links:

Superchain Interop Specs
Optimism Documentation
Supersim Documentation

Additional context
N/A

Metadata
Resolves #227

[jameskim0987]

Hi @fainashalts, this PR is ready for review.

I wasn't sure about the exact output format or the output strings so I kept them minimal to start with. Let me know if it needs to be reformatted/reworded!

[jakim929]

Thank you for your contribution! Mostly looks good - a few suggested changes.

Also, high level, wdyt about making this a command instead of flag? supersim docs instead of supersim --docs. Think it might be better as a command but will leave that up to you

[jameskim0987]

Thank you for your contribution! Mostly looks good - a few suggested changes.

Also, high level, wdyt about making this a command instead of flag? supersim docs instead of supersim --docs. Think it might be better as a command but will leave that up to you

Thank you for the suggestions! I reflected your suggested change from docs flag to a command as it makes more sense to me as well.

Regarding exit steps after printing the links -- in addition to invoking closeApp, I have followed up with os.Exit(0) since without the exit call the app outputs supersim logs which is not necessary for the docs command.

$ ./main docs
Here are the available documentation links:

Superchain Interop Specs
Optimism Documentation
Supersim Documentation
INFO [11-01|19:32:20.788] starting supersim
WARN [11-01|19:32:20.791] err piping stderr to log file            role=anvil name=Local chain.id=900 err="read |0: file already closed"
t=2024-11-01T19:32:20-0400 lvl=crit msg="Application Failed" err="failed to start: orchestrator failed to start: l1 chain Local failed to start: failed to start anvil: context canceled\ncontext canceled"

Let me know how it looks!