End user guide jumping off point and CLI guide

[zimventures]

• new jumping-off page for all of the end user guides.
• new CLI guide

[codecov[bot]]

Codecov Report

Base: 81.36% // Head: 81.36% // No change to project coverage :thumbsup:

Coverage data is based on head (b89156c) compared to base (132565a). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #62 +/- ## ======================================= Coverage 81.36% 81.36% ======================================= Files 45 45 Lines 1996 1996 ======================================= Hits 1624 1624 Misses 372 372 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `81.36% <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=Stackzilla#carryforward-flags-in-the-pull-request-comment) to find out more. Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stackzilla). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stackzilla)

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