chore: remove outdated docker directory

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.02s
✅ MARKDOWN	markdownlint	1	0	0	0.47s
✅ MARKDOWN	markdown-link-check	1		0	1.28s
✅ MARKDOWN	markdown-table-formatter	1	0	0	0.22s
✅ REPOSITORY	git_diff	yes		no	0.05s

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