docs: improving getting started docs for mainnet

[arboleya]

• Closes Create Connecting To Mainnet Documentation #3497

Release notes

In this release, we:

• Improved the Getting Started docs section for mainnet

Summary

• Simplifies presentation
• Removes page duplications
• Shift the focus for mainnet
• Isolate unrelated examples
• Standardize code snippets
• Improves overall formatting
• Provides links for everything
• List sub-items in the page index

For easy reviewing, check the Preview URL:

• https://ts-docs-git-aa-docsconnect-to-mainnet-fuel-labs.vercel.app/guide/getting-started/

Checklist

• All changes are covered by tests (or not applicable)
• All changes are documented (or not applicable)
• I reviewed the entire PR myself (preferably, on GH UI)
• I described all Breaking Changes (or there's none)

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
fuels-template	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 24, 2024 1:15pm
ts-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 24, 2024 1:15pm
ts-docs-api	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 24, 2024 1:15pm

[codspeed-hq]

CodSpeed Performance Report

Merging #3500 will degrade performances by 47.35%

_{Comparing aa/docs/connect-to-mainnet (2c59a56) with master (41c72fb)}

Summary

❌ 1 regressions
✅ 17 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	master	aa/docs/connect-to-mainnet	Change
❌	should successfully conduct a custom transfer between wallets (x20 times)	50.3 ms	95.5 ms	-47.35%

[github-actions]

Coverage Report:

Lines	Branches	Functions	Statements
76.33%(+0%)	69.84%(+0%)	74.2%(+0%)	76.34%(+0%)

Changed Files:

Coverage values did not change👌.