Improve README and documentation coverage; add feature map and docs navigation

[nikivanstein]

Fixed inconsistencies in the readme and docs. Added a feature map to give easy navigation for users.

• Added a Feature Coverage Map section to README.md that links main features to their implementation files and corresponding docs pages.
• Updated Quick Start examples in README.md and docs/Quickstart.rst to import BBOB_SBOX from iohblade.benchmarks and removed an unsupported llm= argument from the example Experiment(...) call.
• Modernized installation docs in docs/Installation.rst to require uv 0.7.19+, corrected the Apple Silicon dependency group name to apple-silicon, and fixed related wording.
• Improved docs navigation by fixing the PyPI badge target in docs/index.rst, adding a short documentation guide on the landing page, expanding the modules toctree, and adding new docs pages: docs/methods.rst, docs/behaviour_metrics.rst, and docs/assets.rst.

[nikivanstein]

@anantashahane , Could you maybe verify why the e2e tests are not passing?
I get everytime the same error: in test_full_matrix_experiment_optimization (the seed function is not valid, meaning the example solution we provide to ReEVO is causing an error).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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