Added New tutorials for Linea

[meowyx]

Adding 2 new tutorials:

• marketplace dapp
• voting dapp

[vercel]

@meowyx is attempting to deploy a commit to the Consensys Team on Vercel.

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[meowyx]

will be updating and making more changes for the next few days!
feel free to leave any review.

[jlwllmr]

Lots of comments but don't be dismayed by the quantity — a lot of are just implementing sentence case! Thanks for putting this together. Let me know if I can expand on any of the comments.

Also since this is just the marketplace dapp, I assume you intend to add the other two guides to this PR at some point?

[jlwllmr]

Thanks for adding the second tutorial, very thorough!

A few overarching points:

• As mentioned last time, all subheadings and headings should be sentence case
• There are a few places where things are capitalised unnecessarily. The only places where we should be capitalising are proper nouns (e.g. product/feature names) or where gramatically necessary.
• I think we can simplify the folder structure, i.e. marketplace-dapp.mdx and voting-dapp.mdx can just live within docs/learn rather than as orphan files in their own directories Implemented this is in my commit
• The sidebar is manual, in sidebars.js, and needs to be updated. I'll push up a commit with this and a few other adjustments we need to make sure the link appears in the navbar too.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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[Gwen-M]

LGTM! Thanks @jlwllmr and @meowyx