Refactor quotes collection from Tom Sachs specific to general purpose

[Copilot]

Converted the Tom Sachs-specific quotes page into a general quotes collection and added the Alex Honnold climate change quote.

Changes

• Renamed _quotes/tom-sachs.md → _quotes/quotes.md
• Updated page title from "Tom Sachs" to "Quotes"
• Added attribution formatting to existing Tom Sachs quote
• Added new quote: "We have this amazing opportunity to make the world better, we just haven't quite chosen to yet." - Alex Honnold on climate change

The quotes section in the site navigation will now display as "Quotes" instead of "Tom Sachs", allowing the collection to scale beyond a single source.

Original prompt

refactor the quotes page so that it's not named Tom's Tom Sachs and instead it's just quotes so we can collect all of the good quotes there. then add a new quote "We have this amazing opportunity to make the world better, we just haven't quite chosen to yet." - Alex Hannold on climate change.

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