Update Installation.md for developer installation

[codecov[bot]]

Codecov Report

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

Project coverage is 48.71%. Comparing base (1f37bfd) to head (e457439).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #255 +/- ## ======================================= Coverage 48.71% 48.71% ======================================= Files 31 31 Lines 8313 8313 ======================================= Hits 4050 4050 Misses 4263 4263 ```

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[hwpang]

Should be solved by https://github.com/ReactionMechanismGenerator/ReactionMechanismSimulator.jl/pull/256