Remove xattr config and alpine tools dependency

[iggy]

• Remove the old way of handling configuration via xattrs
  • this seemed clever at the time and it worked fine, but it was finicky and there really aren't great tools for copying that around (despite what some utils say, they just didn't work as expected)
  • move to a new way of keeping config in separate directory structure
  • static files are still separate, so they can still be served via any web server
• Remove alpine tools dependency
  • we now use the alpine go package to handle generating apkindexes
  • no longer requires having apk and abuild-sign binaries available
• Reorganize the directory and URL structure
  • the above changes requires some minor changes to the dir/url structure
  • you know me, while I was there...

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	4		0	0.52s
✅ COPYPASTE	jscpd	yes		no	1.74s
✅ DOCKERFILE	hadolint	1		0	0.13s
✅ GO	golangci-lint	yes	yes	no	39.61s
✅ GO	revive	yes		no	0.03s
✅ MARKDOWN	markdownlint	2	0	0	0.58s
✅ MARKDOWN	markdown-link-check	2		0	0.53s
✅ MARKDOWN	markdown-table-formatter	2	0	0	0.37s
✅ OPENAPI	spectral	2		0	4.26s
✅ REPOSITORY	checkov	yes		no	24.08s
✅ REPOSITORY	gitleaks	yes		no	0.15s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	20.74s
✅ REPOSITORY	secretlint	yes		no	1.36s
✅ REPOSITORY	trivy	yes		no	18.19s
✅ REPOSITORY	trivy-sbom	yes		no	7.88s
✅ REPOSITORY	trufflehog	yes		no	8.34s
⚠️ SPELL	lychee	12		3	0.36s
✅ YAML	prettier	10	0	0	1.04s
✅ YAML	v8r	10		0	7.96s
✅ YAML	yamllint	10		0	0.58s

See detailed report in MegaLinter reports

MegaLinter is graciously provided by