docs: Fix outdated Apama plugin documentation

[albinsuresh]

Proposed changes

1. Fix broken link to test project zip
2. Use up-to-date screenshots
3. Redirect more to the example repo documentation

I'm even wondering if we should get rid of the whole content and replace it with just some links to the examples repository maintained by the Apama team.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s)
• I ran cargo fmt as mentioned in CODING_GUIDELINES
• I used cargo clippy as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[albinsuresh]

Should get rid of the whole content and replace it with just some links to the examples repository maintained by the Apama team?

[reubenmiller]

Should get rid of the whole content and replace it with just some links to the examples repository maintained by the Apama team?

We'll keep the docs as there are now (with these fixes etc.). Referencing out to the examples repo also doesn't seem like a great solution either...but we can re-evaluate this decision later.

[reubenmiller]

Approved. Thanks for the proactive cleanup

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
476	0	3	476	100	1h12m21.058594999s