Reposition documentation as an ASE extension

[jan-janssen]

The README still framed structuretoolkit as an early-stage library spun out of pyiron_atomistics ("currently under development"). Update the README intro and the API docs landing page to lead with the ase.atoms.Atoms-based framing already used in the introduction notebook, and drop the stale disclaimer.

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Configuration used: defaults

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Run ID: 4712f0eb-c9ba-4630-b54d-ff93d69e0e5f

📥 Commits

Reviewing files that changed from the base of the PR and between dd849b0 and 183f3b5.

📒 Files selected for processing (2)

• README.md
• docs/api.rst

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.90%. Comparing base (dd849b0) to head (183f3b5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #522   +/-   ##
=======================================
  Coverage   97.90%   97.90%           
=======================================
  Files          29       29           
  Lines        2004     2004           
=======================================
  Hits         1962     1962           
  Misses         42       42           

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