Update the selling instruction to add Game Tempaltes

[Bouh]

Do not merge for now.

ToDo:

• [ ] Simplify this page to mention the .gdo in first instead of the technical details.
• [ ] Reorder the Community section, that is a mess with FAQ, selling things, etc. Maybe an Asset Store section is welcome.

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Name	Status	Preview	Comments	Updated (UTC)
gdevelop-wiki	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 6, 2023 0:26am