chore: remove unused gnoview module

[zivkovicmilos]

Description

This PR removes the unused gnoview module. The module could not even be built due to outdated imports.
Additionally, it updates the build.yml by removing a comment related to gnoview.

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Checklist (for contributors)

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually

[moul]

@zivkovicmilos, before merging this, can you open an issue with reference to this PR + the parent commit hash tree view in the cmd/gnoview folder so it's easier to recycle the topic in the future?

Also, try to write a few words about the context if you can find it. I'll make sure to add some more lines, no worries.

[zivkovicmilos]

@moul

Created a discussion about the gnoview functionality here:
#477

I've added the example that was removed with this PR, from the original commit hash

[moul]

Thank you 👍