Add LDX3 London for general

[confs-tech-bot]

Conference information

Website: https://shorturl.at/r86tp
CFP: https://leaddev.submittable.com/submit/312728/talk-submissions-for-ldx3-2025
Twitter: https://twitter.com/@TheLeadDev

Github: @[email protected]

// general

{
  "name": "LDX3 London",
  "url": "https://shorturl.at/r86tp",
  "startDate": "2025-06-16",
  "endDate": "2025-06-17",
  "city": "London",
  "country": "U.K.",
  "online": true,
  "locales": "EN",
  "offersSignLanguageOrCC": true,
  "cocUrl": "https://leaddev.com/code-conduct",
  "cfpUrl": "https://leaddev.submittable.com/submit/312728/talk-submissions-for-ldx3-2025",
  "cfpEndDate": "2025-01-13",
  "twitter": "@TheLeadDev"
}

[github-actions]

Conferences not in the right order,

please run the following command locally: npm run reorder-confs
or run the job reorder job for this branch