Fix bug in README.md titles and links

[RayStick]

When you clicked on the contributor badge at the top of the README it did not jump to the contributor table at the bottom of the README as intended. This is because the hidden text chunk about the Hackathon was not closed

Proposed Changes

• Close the hidden text by adding -->
• Corrected the title for the link text (#contributors-)

Change Type

• bugfix (+0.0.1)
• minor (+0.1.0)
• major (+1.0.0)
• refactoring (no version update)
• test (no version update)
• infrastructure (no version update)
• documentation (no version update)
• other

Checklist before review

• I added everything I wanted to add to this PR.
• [Code or tests only] I wrote/updated the necessary docstrings.
• [Code or tests only] I ran and passed tests locally.
• [Documentation only] I built the docs locally.
• My contribution is harmonious with the rest of the code: I'm not introducing repetitions.
• My code respects the adopted style, especially linting conventions.
• The title of this PR is explanatory on its own, enough to be understood as part of a changelog.
• I added or indicated the right labels.

• I added information regarding the timeline of completion for this PR.

• Please, comment on my PR while it's a draft and give me feedback on the development!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.15%. Comparing base (b782a4a) to head (1a4f0de).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #479   +/-   ##
=======================================
  Coverage   91.15%   91.15%           
=======================================
  Files           8        8           
  Lines        1006     1006           
=======================================
  Hits          917      917           
  Misses         89       89           

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[RayStick]

@all-contributors add @me-pic for pull request review

[allcontributors]

@RayStick

I've put up a pull request to add @me-pic! 🎉