update docs to reflect gcc sherlock version

[ncdorn]

Update documentation to reflect correct gcc version on sherlock

Current situation

Currently, the gcc version specified in the documentation (12.1.0) does not exist on sherlock anymore

Release Notes

The version of gcc in the sherlock build documentation has been updated to 14.2.0

Documentation

documentation main page was changed slightly

Testing

N/A

Code of Conduct & Contributing Guidelines

• [x] I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov[bot]]

Codecov Report

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

Project coverage is 79.42%. Comparing base (edd6156) to head (ac0618b). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #130 +/- ## ======================================= Coverage 79.42% 79.42% ======================================= Files 52 52 Lines 2202 2202 Branches 279 279 ======================================= Hits 1749 1749 Misses 453 453 ```

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[menon-karthik]

@ncdorn Thanks for making this update. Have you checked if the tests still pass using gcc 14.2.0?

[ncdorn]

@menon-karthik the tests (excluding the directed graph tests which I believe are still being updated) pass with gcc 14.2.0 on Sherlock.