docs: refresh install extras and landing pages to current library scope (#274)
* docs: refresh install extras and landing pages to current library scope
The install docs listed only the plot, perf and full extras; add the report
extra (reportlab + svglib, required for the .report() PDF fiches) and fix the
stale 'both' comment on full in the site getting-started pages (EN/ES),
docs/getting-started.md and the README install line.
Refresh the landing pages, which predated most of the library:
- Site index (EN/ES): hero and cards now describe all fifteen domain
namespaces, the 371 conformance checks across 46 domains and 235 standards,
bilingual .plot() figures and the normative .report() PDF fiches.
- Getting started (EN/ES): note that the metrology core is one of fifteen
domains and link Why phonometry and the conformance report.
- Why phonometry (EN/ES): state the current conformance scale beyond the
metrology-core sample table.
- README: current toolkit description, missing domain highlights (hearing,
materials, vibration, aircraft, underwater, electroacoustics, noise control,
FDTD, fiches), five sound-power routes, G weighting, and twelve to fifteen
namespaces.
- Shorten the junction-transmission page titles (EN/ES) to satisfy the
70-character html-validate limit.
* docs: name all standards bodies on the landing description and tighten the ES card wording
Add ANSI, DIN and ECAC/CEAC to the standards-body enumeration in the site
index description (both languages), keep 'con estado' for the stateful block
processing in the Spanish card, and use the Spanish 'Doc 29/32 de la CEAC'
form already used by the Spanish guides.
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