Enabling security via helmet module

[abame]

Implementing security via helmet module by disabling sensitive headers, taking care of CORS and XSS, enabling CSP and more.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ COPYPASTE	jscpd	yes		no	1.2s
✅ HTML	djlint	2		0	0.56s
✅ HTML	htmlhint	2		0	0.21s
✅ JSON	eslint-plugin-jsonc	5	0	0	0.75s
✅ JSON	jsonlint	5		0	0.18s
✅ JSON	npm-package-json-lint	yes		no	0.5s
✅ JSON	prettier	5	0	0	0.46s
✅ JSON	v8r	5		0	7.0s
✅ REPOSITORY	gitleaks	yes		no	0.19s
✅ REPOSITORY	git_diff	yes		no	0.0s
✅ REPOSITORY	secretlint	yes		no	0.59s
✅ REPOSITORY	trivy	yes		no	3.45s
✅ SPELL	cspell	19		0	2.97s
✅ TYPESCRIPT	standard	6	1	0	2.48s
✅ YAML	prettier	2	0	0	0.42s
✅ YAML	v8r	2		0	4.13s
✅ YAML	yamllint	2		0	0.21s

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