Improve typescript documentation

[stafyniaksacha]

What does it do?

• Add step to enable usage of typescript in user-defined plugins
• Add import alias ~/ to project root, so we can import generated ~/schemas and other user-defined types
• Add note about tsconfig target and node version (when using node16, it enables usage of new EcmaScript features such as String.prototype.replaceAll())
• Add @strapi-community as alternative to disabling linters
• Add tips to migrate existing JavaScript project to TypeScript
• Add note about declaration merging

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Name	Status	Preview	Updated
documentation	✅ Ready (Inspect)	Visit Preview	Aug 27, 2022 at 10:42AM (UTC)

[stb13579]

@stafyniaksacha Thanks for the contribution! I will ask one of our developers to look at it and then I can handle the technical writing review.