Update README graphic

[daico007]

PR Summary:

Update the mosdef graphic in README, use new HOOMD logo and add CP2K.

PR Checklist

---

• Includes appropriate unit test(s)
• Appropriate docstring(s) are added/updated
• Code is (approximately) PEP8 compliant
• Issue(s) raised/addressed?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.28%. Comparing base (dac6730) to head (b135295).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1178   +/-   ##
=======================================
  Coverage   87.28%   87.28%           
=======================================
  Files          62       62           
  Lines        6502     6502           
=======================================
  Hits         5675     5675           
  Misses        827      827           

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