Combine Errors and ErrorCodes documentation pages

[petertonysmith94]

After the removal of Debugging Revert Errors page, and there is only a single page under errors. It'd be worth combining Errors and ErrorCodes pages.

Originally posted by @petertonysmith94 in #2050 (comment)

[petertonysmith94]

This should have been a quick fix, however, after numerous attempted to get a single page in the config and numerous CI failure, I believe this is blocked by FuelLabs/github-actions#30.

We should look at refactoring the related vp-docs.js script to better handle our configuration file.

Setting as blocked for now.

[arboleya]

I vaguely remember some gotchas we had with this, maybe some missing or unexpected trailing slashes?

@Dhaiwat10 I think it was one of your PRs. Ideas?

[Dhaiwat10]

@arboleya unfortunately I don't seem to be remember any details. 🤔

[petertonysmith94]

I tried all the gotchas I had written down. I even pulled the script and ran locally all fine. Once in the CI, the behaviour changed.

We spend quite a lot of time with this one,so I think its worth investigating a long term solution IMO.