minor description fixes for pypi

[bhazelton]

Description

Fixes to allow the hera_mc package to be uploaded to pypi and for links in the description there to work (tested on testpypi).

Motivation and Context

I couldn't properly test this until we made a new release. Upon testing, I found that it errored because it was expecting an RST description instead of markdown. I fixed that and also fixed some links that were broken (I tested this on testpypi by adding local git tags to my repo so that I could simulate versions. I should have thought of doing that before but didn't).

To see how it appears on testpypi follow this link: https://test.pypi.org/project/hera-mc/

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Schema change (any change to the SQL tables)
• [ ] New feature without schema change (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Version change
• [x] Build or continuous integration change
• [ ] Other

Checklist:

Build or continuous integration change checklist:

• [ ] If required or optional dependencies have changed (including version numbers), I have updated the readme to reflect this.

[codecov[bot]]

Codecov Report

Merging #591 (a695c0d) into main (e22d202) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #591   +/-   ##
=======================================
  Coverage   97.76%   97.76%           
=======================================
  Files          35       35           
  Lines        5110     5110           
=======================================
  Hits         4996     4996           
  Misses        114      114           

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