BP-2636: Unhide Jira integration docs

[jeff-matthews]

The Jira integration has been published on the Atlassian Marketplace, so we can now make the docs public and searchable.

Related to #321

Summary by CodeRabbit

• New Features

  • Added Jira to the supported integrations overview.
  • Made Jira setup, usage, reference, and troubleshooting documentation available.

• Documentation

  • Simplified Jira installation instructions with direct Marketplace navigation and clearer installation steps.

[coderabbitai]

Walkthrough

Jira documentation pages are made visible, the Jira card is enabled in the integrations overview, and the installation guide now directs readers through a shortened Marketplace installation flow.

Changes

Jira documentation updates

Layer / File(s)	Summary
Surface Jira documentation docs/integrations/atlassian/jira/*.mdx, docs/integrations/overview.mdx	Removes hidden frontmatter from Jira pages and enables the Jira integration card in the supported integrations section.
Streamline Jira installation docs/integrations/atlassian/jira/configure.mdx	Replaces Marketplace search instructions with direct listing navigation and the steps to get, select, and install the app.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• SpecterOps/bloodhound-docs#321: Reverses the earlier Jira documentation hiding and card-commenting changes.

Poem

A bunny hops where Jira docs now gleam,
No hidden pages, just a clearer stream.
“Get it now!” the Marketplace sings,
Pick your Cloud site, install the things.
The Jira card joins the integration dream!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: making the Jira integration docs public.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch BP-2638-unhide-jira

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