Update docs section - JOSS paper

[rwood-97]

Summary

Since we updated the documentation it might be good to not explicitly explain each page in the docs but rather to give an overview of whats included. This is towards https://github.com/openjournals/joss-reviews/issues/6434

Fixes #486

Describe your changes

Changed the docs paragraph.

Checklist before assigning a reviewer (update as needed)

• [x] Self-review code
• [x] Ensure submission passes current tests
• [ ] Add tests
• [ ] Update relevant docs

Reviewer checklist

Please add anything you want reviewers to specifically focus/comment on.

• [ ] Everything looks ok?

[rwood-97]

https://github.com/Living-with-machines/MapReader/actions/runs/10301603483 updated paper here

[codecov[bot]]

Codecov Report

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

Project coverage is 62.04%. Comparing base (99f21a4) to head (41ebd73).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #485 +/- ## ======================================= Coverage 62.04% 62.04% ======================================= Files 44 44 Lines 7045 7045 ======================================= Hits 4371 4371 Misses 2674 2674 ``` | [Flag](https://app.codecov.io/gh/Living-with-machines/MapReader/pull/485/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Living-with-machines) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/Living-with-machines/MapReader/pull/485/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Living-with-machines) | `62.04% <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=Living-with-machines#carryforward-flags-in-the-pull-request-comment) to find out more.

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