fix(slide-deck): add missing web/templates folder

[madhununna]

Fixes #847

Concise description of the PR

Added missing web/templates/ folder containing 6 HTML templates required by the Flask web app. Also fixed .gitignore which had *.html silently preventing the templates from being tracked.

User experience

Before: Running the Web UI crashes immediately with TemplateNotFound errors — the app is completely unusable.

After: All pages load correctly. Users can access the home page, basic agent interface, memory agent interface, side-by-side comparison, and error pages.

Note: Templates are intentionally minimal to unblock the Web UI. Visual polish can be addressed in a follow-up issue if desired.

Checklist

• I have reviewed the contributing guidelines
• Add your name to CONTRIBUTORS.md
• Are you uploading a dataset?
• Have you documented Introduction, Architecture Diagram, Prerequisites, Usage, Sample Prompts, and Clean Up steps in your example README?
• I agree to resolve any issues created for this example in the future
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Flask app references 6 HTML templates that were never committed, causing TemplateNotFound errors when running the Web UI.

Also update .gitignore to allow web/templates/.html since the existing '.html' rule was silently excluding them.

Fixes #847

Amazon Bedrock AgentCore Samples Pull Request

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Issue number:

Concise description of the PR

Changes to ..., because ...

User experience

Please share what the user experience looks like before and after this change

Checklist

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• I have reviewed the contributing guidelines
• Add your name to CONTRIBUTORS.md
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Are you uploading a dataset?
• Have you documented Introduction, Architecture Diagram, Prerequisites, Usage, Sample Prompts, and Clean Up steps in your example README?
• I agree to resolve any issues created for this example in the future.
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

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