Update README to Reflect Project Usecase

shelikhoorequested to merge
shelikhoo/snowflake:dev-readme-update-2025-mar into main

This merge request amended README to:

  1. shows more ways to operate a proxy.
  2. make it more clear that snowflake is an anti-censorship tool.
  3. remove non-functional build status badge.

(Fixes #40450 (closed))

Edited by shelikhoo

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