Ensure end user-focused component documentation is available in opentelemetry.io

[mx-psi]

OpenTelemetry Collector component documentation should be available in opentelemetry.io.

This is part of Ecosystem Explorer (view)

I will keep this issue up to date as the Collector SIG tasks become more clear.

See also SIG Comms + SIG Collector: Doc refactoring (view) and https://github.com/open-telemetry/opentelemetry.io/blob/main/projects/collector-docs-refactor/collector-docs-refactor.md