Remove GitHub issue generator feature

[Copilot]

Removes the AI-powered GitHub issue generation feature per requirements.

Changes

Routes removed (blt/urls.py):

• /github-issue-prompt/ - Issue generation form
• /create-github-issue/ - GitHub issue creation endpoint
• /get-github-issue/ - AI generation processor

Views removed (website/views/issue.py):

• GithubIssueView - Issue creation handler (44 lines)
• get_github_issue() - Generation request processor (27 lines)
• generate_github_issue() - OpenAI API integration (45 lines)
• OpenAI import (still used in utils.py and bot.py)

Templates deleted:

• github_issue_prompt.html - Input form (94 lines)
• github_issue.html - Issue creation form (246 lines)

UI cleanup:

• Navigation links removed from header and sidenav
• Feature card removed from features page
• Static asset generate-issue.png deleted
• Duplicate keywords cleaned from features page metadata

Total: 510 lines removed across 8 files

Original prompt

Remove the generate issue feature

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