Add oxfmt

[DBozhinovski]

• Migrates all rules over to oxfmt config;
• Updates CONTRIBUTING;
• Formats full codebase;
• Makes editorconfig as consistent as possible with oxfmt;
• Removes prettierrc.

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Latest commit: c79a6c6

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commit: c79a6c6

[brenelz]

We should probably prioritize this. Otherwise we will keep getting conflicts