Bump memory requirement for docs site build (#1644)

- Required by #1653

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [ ] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

Author: pokey

scripts/build-and-assemble-website.sh

@@ -4,7 +4,7 @@ set -euo pipefail
 pnpm install
 pnpm compile
 
-NODE_OPTIONS="--max-old-space-size=4096" \
+NODE_OPTIONS="--max-old-space-size=6144" \
   pnpm \
   --filter 'cursorless-org' \
   --filter 'cursorless-org-*' \