docs: fix network file format, transition rules, and orphaned page

[AdishAssain]

Documentation corrections found during UAT (PyPI install wording intentionally left unchanged).

• NetworkFile format: configuration.md showed source,target,weight, but the loader requires a leading day column. Updated the example to day,source,target,weight with self-loops, and documented day.
• Transition rule: clarified that an expression naming the source compartment is used as-is, otherwise it's multiplied by the source — so gamma and gamma * I are equivalent (both give gamma * I). Documented that S -> I: beta becomes the network force of infection in multi-patch models, and that single-patch models need an explicit I term.
• network-design.md: corrected the claim that weights are auto-normalized to sum to 1 — they are used as given.
• index.md: added architecture.md to the toctree (it was orphaned; this also makes the -W Sphinx build clean).

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Reviewing files that changed from the base of the PR and between c82fe49 and 37308d9.

📒 Files selected for processing (3)

• docs/configuration.md
• docs/index.md
• docs/network-design.md

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