Add basic landing page

[jthorton]

Description

Updates the landing page with information about the scope of the package and its place in the eco-system, also adds links to other tools.

Todos

Notable points that this PR has either accomplished or will accomplish.

• TODO 1

Questions

• Question1

Status

• Ready to go

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.03%. Comparing base (e8bb980) to head (df0c982).
⚠️ Report is 32 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #156   +/-   ##
=======================================
  Coverage   80.03%   80.03%           
=======================================
  Files          16       16           
  Lines        1087     1087           
=======================================
  Hits          870      870           
  Misses        217      217           

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[IAlibay]

Just the one thing, otherwise this is good to go.

[IAlibay]

Might be good somewhere here to mention that it used to be called arsenic, because they'll have seen references to arsenic in the literature.