Rework the coffee page around method, kit and a test-driven quip

Inizia da coffee.html e ispeziona la struttura esistente della pagina, i metadati, le OG descriptions, il testo della index card e i riferimenti a llms.txt. Sostituisci il contenuto specificato e le foto reali, quindi esegui check-render su desktop e a 375px; il lavoro è completo quando tutti i criteri di accettazione sono soddisfatti, inclusi i wrapper interni di .items e la rimozione del link coffee-notes.

coffee.html is linked from William's CV ("opinionated about automation, linting, and how to brew a good cup of coffee"), so recruiters are likely to read it. As it stands it undersells the engineering angle: the intro calls the approach "a bit over-engineered for the problem at hand", and it links a notes repo that looks abandoned (two bean notes, last pushed March 2025).

Page structure

1. Banner: new hero, Nathan Dumlao's latte-on-beans photo from Unsplash (XOhI_kW_TaM), cropped 1:1 and centred on the cup, with an Unsplash credit badge like the other pages that use Unsplash photos.
2. Approach: a short intro that sets up the quip: "Every recipe here started as a baseline and got better by making one controlled change at a time. Test-driven brewing, more or less."
3. Book spotlight: James Hoffmann's The Best Coffee at Home, a birthday gift William recommends. This replaces the Hoffmann sentence currently tacked onto the recipe.
4. Grinder spotlight: a budget Breville conical burr grinder, still going after about ten years. Framed as a great-value purchase that has taken him a long way into the hobby.
5. One method each, a spotlight for the kit and a recipe grid under it, including that method's grind setting:
   • French press: the daily driver, over 95% of brews. 16g / 600ml / 92°C / 6 min, two cafetières into an insulated flask for four workday cups. The dose is deliberately lighter than Hoffmann's, and the copy says why.
   • AeroPress: office and travel.
   • Moka pot: espresso-style drinks at home, or when a recipe calls for one.
6. Bean gallery: "Some of my favourite beans", photos of the bags with roaster, origin and process as captions. No tasting notes needed.

Out of scope for now

• The coffee-notes repo link is removed rather than kept, until the repo has enough in it to be worth linking.

Acceptance criteria

• "Over-engineered" wording is gone, and the new quip is present.
• No link to github.com/laywill/coffee-notes remains on the page.
• Every image is a real photo: no placeholder remains (the photos come from William: book, grinder, each brewer, bean bags).
• The AeroPress and Moka pot recipes and every method's grind setting are real numbers, not placeholders.
• The meta and OG descriptions, llms.txt and the index card copy match the new page.
• Every .items section has its inner wrapper; check-render passes at desktop and 375px.