feat: Document not authenticated users management

[taorepoara]

About this PR

Closes #146

Technical highlight/advice

How to test my changes

Get the project code and run the next commands:

npm i
npm start

Then open the next links:

• http://localhost:8080/guides/public-routes.html
• http://localhost:8080/features/routes.html

Checklist

• I didn't over-scope my PR
• My PR title matches the commit convention
• I did not include breaking changes
• I made my own code-review before requesting one

I included unit tests that cover my changes

• 👍 yes
• 🙅 no, because they aren't needed
• 🙋 no, because I need help

I added/updated the documentation about my changes

• 📜 README.md
• 📕 docs/*.md
• 📓 docs.lenra.io
• 🙅 no documentation needed

[shiipou]

🎉 This PR is included in version 1.1.0 🎉

The release is available on:

• GitHub release
• v1.1.0

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