First pass on the new documentation of CUTEst.jl

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.72727% with 6 lines in your changes missing coverage. Please review.

Project coverage is 74.04%. Comparing base (f2ad6a4) to head (ecde7cb). Report is 92 commits behind head on main.

Files with missing lines	Patch %	Lines
src/sifdecoder.jl	62.50%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #408 +/- ## =========================================== - Coverage 89.11% 74.04% -15.07% =========================================== Files 5 8 +3 Lines 790 1630 +840 =========================================== + Hits 704 1207 +503 - Misses 86 423 +337 ```

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