Override hyperlink + fetch & display avatars in markdown

[nvuillam]

• Allow to override hyperlink on README badge using option --docurl
• Also fetch GitHub repositories avatars, for a nicer result in markdown :)

[github-actions[bot]]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
⚠️ ACTION	actionlint	3		1	0.11s
✅ COPYPASTE	jscpd	yes		no	2.55s
⚠️ DOCKERFILE	hadolint	2		1	0.12s
✅ JSON	eslint-plugin-jsonc	3	0	0	1.02s
✅ JSON	jsonlint	3		0	0.16s
✅ JSON	prettier	3	0	0	0.78s
✅ JSON	v8r	3		0	3.08s
⚠️ MAKEFILE	checkmake	1		1	0.01s
⚠️ MARKDOWN	markdownlint	11	0	15	1.39s
✅ MARKDOWN	markdown-link-check	11		0	9.14s
✅ MARKDOWN	markdown-table-formatter	11	0	0	0.32s
✅ PYTHON	bandit	6		0	1.34s
✅ PYTHON	black	6	0	0	0.9s
✅ PYTHON	flake8	6		0	0.39s
✅ PYTHON	isort	6	0	0	0.3s
⚠️ PYTHON	mypy	6		5	6.94s
✅ PYTHON	pylint	6		0	3.25s
⚠️ PYTHON	pyright	6		8	8.88s
✅ PYTHON	ruff	6	0	0	0.03s
✅ REPOSITORY	checkov	yes		no	10.36s
✅ REPOSITORY	gitleaks	yes		no	1.86s
✅ REPOSITORY	git_diff	yes		no	0.02s
✅ REPOSITORY	grype	yes		no	11.87s
✅ REPOSITORY	secretlint	yes		no	0.87s
✅ REPOSITORY	trivy	yes		no	7.34s
✅ REPOSITORY	trivy-sbom	yes		no	1.68s
✅ REPOSITORY	trufflehog	yes		no	2.28s
✅ SPELL	cspell	45		0	3.75s
✅ SPELL	lychee	27		0	2.03s
✅ YAML	prettier	13	0	0	1.18s
✅ YAML	v8r	13		0	19.29s
✅ YAML	yamllint	13		0	0.36s

See detailed report in MegaLinter reports

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