Add Psychology of Bitcoiners (MBTI) research to design research page

[Copilot]

Brandon Quittem's Myers-Briggs personality type research on bitcoiners was missing from the design research page.

Changes

• Added new entry at the top of the Independent research section in guide/resources/design-research.md:

#### [The Psychology of Bitcoiners](https://brandonquittem.com/bitcoin-myers-briggs-mbti/)

_2025 by Brandon Quittem._

An analysis of the Myers-Briggs Type Indicators (MBTI) of bitcoiners, exploring the personality types most common among bitcoin holders and how psychological traits relate to bitcoin adoption.

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[GBKS]

Looks great.