📖 Update docs for catalogd TLS and other cleanup

[trgeiger]

• remove $ prompt from command examples
• a couple small fixes in the README
• update references to Catalogs to ClusterCatalogs

Description

Reviewer Checklist

• [ ] API Go Documentation
• [ ] Tests: Unit Tests (and E2E Tests, if appropriate)
• [ ] Comprehensive Commit Messages
• [ ] Links to related GitHub Issue(s)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.16%. Comparing base (edc91ad) to head (09a6148). Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #940 +/- ## ========================================== - Coverage 79.34% 79.16% -0.19% ========================================== Files 16 16 Lines 1104 1104 ========================================== - Hits 876 874 -2 - Misses 158 159 +1 - Partials 70 71 +1 ``` | [Flag](https://app.codecov.io/gh/operator-framework/operator-controller/pull/940/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework) | Coverage Δ | | |---|---|---| | [e2e](https://app.codecov.io/gh/operator-framework/operator-controller/pull/940/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework) | `57.60% <ø> (-0.55%)` | :arrow_down: | | [unit](https://app.codecov.io/gh/operator-framework/operator-controller/pull/940/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework) | `53.71% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=operator-framework#carryforward-flags-in-the-pull-request-comment) to find out more.

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