Installation instructions warn about development installation.

[sheiksadique]

Checklist before requesting a review

• [N/A ] Tests for the changes have been added (for bug fixes/features)

• [ x] Docs have been added / updated (for bug fixes / features)

• [x ] I have performed a self-review of my code

• [ N/A] Will this be part of a product update? If yes, please write one line about this on the CHANGELOG.md

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) A short mention of the risks of installing with -e flag when using plugin packages has been added.

• What is the current behavior? (You can also link to an open issue here) Addresses #225

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) N/A

• Other information:

[codecov[bot]]

Codecov Report

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

Comparison is base (205ccf4) 90.91% compared to head (060f369) 90.91%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #226 +/- ## ======================================== Coverage 90.91% 90.91% ======================================== Files 52 52 Lines 2718 2718 ======================================== Hits 2471 2471 Misses 247 247 ```

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[MinaKh]

Thanks @sheiksadique , I uninstalled my sinabs and installed it in non developer mode and could import sinabs-exodus. Thanks for adding the note in installation instructions. This PR closes the task in https://github.com/synsense/sinabs/issues/218#issuecomment-1929449466