feat: allow setting an initial theme value via optional useTheme argument

[christianblandford]

useTheme now takes an optional parameter for the initial value. This is useful as it allows hook chaining.

For example, a user could have a hook/function that reads the end-user's preferred theme from storage, and passes it to the useTheme hook.

A rough example:

const storedTheme = useConfig('theme')
const {theme, setTheme} = useTheme(storedTheme)

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