Minor updates for best practices/linting/security

[nathanmcgarvey-modopayments]

• minor security enhancements in helm chart
• minor best-practices/linting (E.g. using select{} instead of a ifinite loop with sleep, using log.Print vs fmt.Print, formatted the imports, etc.)
• minor readme changes (linting for links and header sizes, removal/change for dead link(s), and addition of some other log collectors like Promtail and Logstash)
• bump go to 1.20 to pull in some security fixes
• bump k8s.io deps to v0.24.15 (note that this version is about to become non-maintained, but still is for now)