✨ Add Upcoming Integrations Teaser

[mlamina]

This PR introduces a teaser for upcoming integrations in the PR Pilot dashboard. It enhances the user interface and provides a preview of future capabilities.

Dashboard Enhancements

• Update integrations.html to include new integrations.
• Extract Slack, Linear, Sentry, CircleCI, JIRA, and Logstash tab panes into separate templates.

New Integration Templates

• Add slack.html for Slack integration.
• Add linear.html for Linear integration.
• Add sentry.html for Sentry integration.
• Add circleci.html for CircleCI integration.
• Add jira.html for JIRA integration.
• Add logstash.html for Logstash integration.

Documentation Updates

• Update integrations.md to include upcoming integrations with detailed descriptions and examples.

Miscellaneous

• Remove old daily report files.
• Add custom CSS for disabled clickable elements in base.html.