Update tutorial with recent syntax changes

[JanCVanB]

I've already started editing tutorial.md locally, but I'm creating this to track the variety of changes we need/want:

(sorted by first impacted location in tutorial)

• Minimize !" use in example strings, to help effectful function names pop and prevent exclamation fatigue
• Bump dependencies to the best ones for December (frozen during AoC)
• Update main =s to main! = \{} ->s
• Update Stdfoo.bars to Stdfoo.bar!s
• Explain early return (return)
• Explain early error return (try)
• Explain effectful functions (!)
• Explain effectful function type (=>)
• Remove Tasks section and all references to task-related vocabulary

PR coming soon!

[JanCVanB]

I wonder how many days before AoC 1% of participants start learning a new language.

[ErikFeeley]

I am not new to the language but I had thought about freshening up on Roc as early as a week or two ago when thinking about using it for AoC this year.

[JanCVanB]

@ErikFeeley Thank you! That's helpful to know. If you want, I can ping you again next week for feedback on the updated tutorial. 🙂

[fpsvogel]

I am new to the language, except for a read-through of the tutorial a couple months ago, after which life got busy and now I'm coming back to give Roc a proper try (pun intended).

Thank you for working on the tutorial! If you want feedback from a newbie, let me know.

[ErikFeeley]

@JanCVanB sounds good but no worries! I am honestly not sure how much time I'll get to dedicate to AoC this year. But I'll try to give some feedback if I get around to giving it a go :).