Chore: Remove !wsl and /wsl?

[MaoShizhong]

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• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this issue follows the command name: brief description of request format, e.g. /help: add optional @user parameter

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Description of the Feature Request

!wsl and /wsl were useful when WSL support was first introduced. It's now been long enough that a dedicated command just to direct people to #wsl-help isn't necessary anymore, and it hasn't been used for a long time outside of people discovering it in #bot-spam-playground.

Can these be removed?

Acceptance Criteria

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1. !wsl and /wsl-related code is removed from the repo

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[MaoShizhong]

Side note, I haven't noticed or found much if any use of !google nor !searchtop for a long time. Their slash equivalents /search google and /search top do see good use. I wonder if one or both of them may also be considered for pruning? The other legacy ! commands still see good inline use.