add additional clearing and strategy docs

[maurerle]

• add additional clearing and strategy docs
• update copyright
• use version from pyproject.toml in docs version

[codecov[bot]]

Codecov Report

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

Comparison is base (7575201) 83.03% compared to head (77dff57) 83.03%.

:exclamation: Current head 77dff57 differs from pull request most recent head 3483eb4. Consider uploading reports for the commit 3483eb4 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #283 +/- ## ======================================= Coverage 83.03% 83.03% ======================================= Files 40 40 Lines 4538 4538 ======================================= Hits 3768 3768 Misses 770 770 ``` | [Flag](https://app.codecov.io/gh/assume-framework/assume/pull/283/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=assume-framework) | Coverage Δ | | |---|---|---| | [pytest](https://app.codecov.io/gh/assume-framework/assume/pull/283/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=assume-framework) | `83.03% <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=assume-framework#carryforward-flags-in-the-pull-request-comment) to find out more.

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[nick-harder]

@maurerle could you please also fix the requirements here so we can make a release?