[Docs]: Update and improve the Discord weather bot tutorial

[jonaro00]

This tutorial (source) is outdated and we also want a copy of it in shuttle-examples.

We would love if someone could:

• Follow the tutorial to build the bot
• Update it to Serenity 0.12 (and other crates to latest versions)
• Make any other improvements that you think are needed
• Update the tutorial's code snippets and instructions with any changes that were made. The screenshots can remain the same if nothing of substance changed.
• Make a PR to shuttle-examples with the updated code in serenity/weather-forecast (a README is not needed since there is a tutorial covering it)
• Make a PR to shuttle-docs with the updated tutorial

---

_{This issue is open to contribution. Comment if you want to work on it. Feel free to ask for help and guidance here or in our Discord.}

[Lonanche]

I would like to have a go on this

[jonaro00]

@Lonanche All yours! Have fun :D

[Lonanche]

@jonaro00

List of changes I made: -Updated tutorial code snippets to use Serenity 0.12 (https://github.com/shuttle-hq/shuttle-docs/pull/264) -Changed one screenshot because discord changed how to obtain discord guild ID -Submitted final code of tutorial to serenity/weather-forecast in shuttle-examples (https://github.com/shuttle-hq/shuttle-examples/pull/146) -Made some small changes in tutorial because some parts were unclear while I was following it

Let me know if any of the stuff have to be changed!

[c-git]

@Lonanche happy you got to this. I was planning to try to do it tonight. So I'll give yours a test run and give you feedback instead.

[c-git]

I skimmed through it and it looks good. I didn't actually try it like I planned because I want to use poise for my project as I expect it may grow and that is recommended in the tutorial. Thank you very much for updating this.