Migrate to svelte

[shm379]

This pull request significantly updates the README.md to reflect the ongoing migration of Telegram Web A from its original Teact-based UI to Svelte. The new documentation outlines the migration strategy, current progress, project structure, and updated commands, making it easier for contributors to understand the project's direction and how to get involved. Additionally, new Svelte build artifacts are included in the dist-svelte/assets directory, likely as part of the migration process.

Documentation and project direction:

• Major rewrite of README.md:
  • Explains the motivation and strategy for migrating the UI from Teact to Svelte.
  • Details current migration progress, including which features are already working in the Svelte build.
  • Adds a project map, migration strategy, updated quick start instructions, and lists core dependencies.
  • Clarifies how to contribute and where to report bugs for the official app.

Svelte build artifacts:

• Adds new Svelte-compiled assets:
  • dist-svelte/assets/APEv2Parser-CAMkrNbL.js: Svelte build output for the APEv2 parser module.
  • dist-svelte/assets/APEv2Parser-CR3dYEa_.js: Svelte build output for the APEv2 parser export wrapper.
  • dist-svelte/assets/AbstractID3Parser-CFvAXaKF.js: Svelte build output for the abstract ID3 parser module.

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