Exclude Alpine Linux and Oracle Linux OVAL data and add licenses

Relevant Slack thread

Removes the following data sources:

• Alpine Secfixes Tracker
• Alpine Issue Tracker
• Oracle Linux Errata

Contains the following licenses in LICENSE:

• GitLab Advisory Database Terms
• Amazon Linux Security Center: MITRE/CC-BY 4.0
• SUSE CVRF: CC-BY 4.0
• GitHub Security Advisory: CC-BY 4.0
• Go Vulnerability Database: CC-BY 4.0
• Red Hat OVAL v2: CC-BY 4.0
• Red Hat Security Data API: CC-BY 4.0

Compare with my license listing for vuln-list.

Pipeline passed on my fork