Improve documentation for developers and maintainers.

[codecov[bot]]

Codecov Report

Base: 86.14% // Head: 86.14% // No change to project coverage :thumbsup:

Coverage data is based on head (537e334) compared to base (48133eb). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #151 +/- ## ======================================= Coverage 86.14% 86.14% ======================================= Files 9 9 Lines 895 895 ======================================= Hits 771 771 Misses 124 124 ``` | Flag | Coverage Δ | | |---|---|---| | py-3.10 | `86.03% <ø> (ø)` | | | py-3.8 | `85.98% <ø> (ø)` | | | py-3.9 | `86.09% <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=aiidalab#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=aiidalab). 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=aiidalab)

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[csadorf]

@superstar54 Do you think you will be able to have a look at this soon?