Rework on the Minecraft account linking process #14

I observed last night that some of our players (particularly Bedrock) are required to memorize 3–4 words, but they still have difficulty remembering them enough to send to the Eden's Discord bot via DMs.

To address this issue, we can consider two possible solutions:

• Reduce the TTL for each challenge and provide players with an approximate time remaining of when their last challenge will expire:
  

  eden/crates/eden-gateway-server/src/controllers/members/link.rs

  Lines 27 to 28 in 77f69da

  	// This is to give time for both Java and Bedrock players to solve the challenge
  	static DEFAULT_CHALLENGE_TTL: Duration = Duration::from_mins(10);

• Revise the linking process so it's clearer and easier to follow, even players with all levels can connect their Minecraft account to their Discord account more smoothly (Bedrock players only)