Update documentation site and docstrings

[abhro]

• Fix markdown usage
• Make code examples more easy to read
• Use Documenter v1 for building

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.99%. Comparing base (41cf9dd) to head (4cd2a2e).

Files	Patch %	Lines
src/data/reconstructing_datatypes.jl	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #570 +/- ## ========================================== - Coverage 87.00% 86.99% -0.01% ========================================== Files 31 31 Lines 4317 4315 -2 ========================================== - Hits 3756 3754 -2 Misses 561 561 ```

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[JonasIsensee]

Thank you for this cleanup !