Rework query strategy documentation

[chschroeder]

Topic / Scope

https://small-text.readthedocs.io/en/latest/components/query_strategies.html

This page does not look inviting and could also be much more organized.

Let me know if you have any ideas or wishes.

Expected content

Am not sure how to solve this. Also, we are limited by the documentation software, i.e. the solution has to work within the sphinx documentation.

Addition information

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