Add roadmap to README and change layout

[RemDelaporteMathurin]

This PR simply changes the README by changing the layout and adding the public roadmap for more visibility

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.47%. Comparing base (91e59ac) to head (a6d0db2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #709   +/-   ##
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  Coverage   99.47%   99.47%           
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  Files          58       58           
  Lines        2290     2290           
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  Hits         2278     2278           
  Misses         12       12           

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[jhdark]

It might be worth adding a citation title linking the newly accepted reference paper. Plus we could potentially clump some of these subtitles to make it more readable, not sure

[RemDelaporteMathurin]

It might be worth adding a citation title linking the newly accepted reference paper. Plus we could potentially clump some of these subtitles to make it more readable, not sure

Should we do this once the paper is published?

[jhdark]

LGTM