feat: improved react snippets massively and fixed "Compoment" typos with "Component"

- removed all "import React from 'React'" snippets. since react 17,
importing react like that is no longer needed.
- changed all "import React, { someComponent }" to "import { some
Component }" for same reason as above.
- fixed all "Compoment" typos with "Component" in javascript/ directory.

Author: monoira