Fix missing CNAME file for custom gh-pages domain

[github-actions[bot]]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	2		0	0.03s
✅ CREDENTIALS	secretlint	yes		no	1.54s
✅ GIT	git_diff	yes		no	0.03s
✅ JSON	eslint-plugin-jsonc	3	0	0	1.39s
✅ JSON	jsonlint	3		0	0.82s
✅ JSON	prettier	3	0	0	0.62s
✅ JSON	v8r	3		0	3.08s
✅ MARKDOWN	markdownlint	17	0	0	1.09s
✅ MARKDOWN	markdown-link-check	17		0	49.3s
✅ MARKDOWN	markdown-table-formatter	17	0	0	0.35s
✅ PYTHON	bandit	1		0	0.29s
✅ PYTHON	black	1	0	0	0.35s
✅ PYTHON	flake8	1		0	0.44s
✅ PYTHON	isort	1	0	0	0.19s
✅ PYTHON	mypy	1		0	6.21s
✅ SPELL	cspell	48		0	3.37s
✅ SPELL	misspell	48	0	0	0.12s
✅ YAML	prettier	5	0	0	0.66s
✅ YAML	v8r	5		0	5.26s
✅ YAML	yamllint	5		0	0.17s

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