MVP website/marketplace for community collectors/alerts

[odyslam]

Website: https://netdata-marketplace.pages.dev/
GitHub: https://github.com/OdysLam/netdata-

• Share MVP with the community
• Share MVP internally
• Fix absence of social image for sharing
• Refine about page (needs larger space between text)
• append installation instructions in every collector/alert, at the end of the page for ease of use
• Change community repo + readme to add mention for community plugins for statsd