Remove dead content: scaffolding leftovers and abandoned doc draft

[ideaship]

Removes dead content from the repository: an abandoned documentation draft plus leftover files from the original Docusaurus scaffolding. All files were verified to be unreferenced anywhere in docs/, src/, or config (and, in the draft's case, never built) before removal.

• Two commits:
  • Remove Docusaurus scaffolding leftovers — docusaurus.png, the three undraw_docusaurus_*.svg illustrations, and the stray root-level .gitkeep (pointless since the repo root is not an empty directory).
  • Remove abandoned openstack.md.x draft — an abandoned alternate draft of openstack.md that Docusaurus never built (only .md/.mdx are built).

Not included (held back pending intent): the unused vendor logos logo-{b1systems,gardener,prometheus,proxmox,stackxperts}.svg and the static/img/screenshots/ folder, which may be staged for a future partners/features page.

🤖 Generated with Claude Code

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	4		0	0	0.02s
✅ JSON	jsonlint	4		0	0	0.08s
✅ JSON	prettier	4		0	0	0.37s
✅ JSON	v8r	4		0	0	9.99s
⚠️ MARKDOWN	markdownlint	160		4	0	2.31s
⚠️ MARKDOWN	markdown-table-formatter	160		1	0	0.42s
✅ REPOSITORY	checkov	yes		no	no	18.68s
✅ REPOSITORY	git_diff	yes		no	no	0.07s
✅ REPOSITORY	secretlint	yes		no	no	1.68s
✅ REPOSITORY	trufflehog	yes		no	no	4.14s
✅ SPELL	codespell	169		0	0	0.45s
✅ SPELL	lychee	169		0	0	24.12s
✅ YAML	prettier	5		0	0	0.33s
✅ YAML	v8r	5		0	0	6.66s
✅ YAML	yamllint	5		0	0	0.39s

Detailed Issues

⚠️ MARKDOWN / markdown-table-formatter - 1 error

1 files contain markdown tables to format:
- docs/guides/developer-guide/retiring-openstack-releases.md

⚠️ MARKDOWN / markdownlint - 4 errors

docs/guides/developer-guide/retiring-openstack-releases.md:181:450 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
docs/guides/developer-guide/retiring-openstack-releases.md:181:535 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
docs/guides/developer-guide/retiring-openstack-releases.md:183:417 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
docs/guides/developer-guide/retiring-openstack-releases.md:183:502 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]

Notices

📣 MegaLinter 9.5.0 is out! Discover the new features and security recommendations in the release announcement. (Skip this info by defining SECURITY_SUGGESTIONS: false)

See detailed reports in MegaLinter artifacts

Your project could benefit from a custom flavor, which would allow you to run only the linters you need, and thus improve runtime performances. (Skip this info by defining FLAVOR_SUGGESTIONS: false)

• Documentation: Custom Flavors
• Command: npx mega-linter-runner@9.5.0 --custom-flavor-setup --custom-flavor-linters ACTION_ACTIONLINT,JSON_JSONLINT,JSON_V8R,JSON_PRETTIER,MARKDOWN_MARKDOWNLINT,MARKDOWN_MARKDOWN_TABLE_FORMATTER,REPOSITORY_CHECKOV,REPOSITORY_GIT_DIFF,REPOSITORY_SECRETLINT,REPOSITORY_TRUFFLEHOG,SPELL_LYCHEE,SPELL_CODESPELL,YAML_PRETTIER,YAML_YAMLLINT,YAML_V8R

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