Make the `from` prop of `<Sequence>` optional #1431

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Currently, <Sequence> takes two props for timing: from and durationInFrames, of which durationInFrames is optional. We can also make from optional.

Acceptance criteria

• Make from optional and default it to 0.
• Update the documentation and mention that the prop is optional from the next version on
• Go through all uses of <Sequence> in the docs and make remove from={0} (unless making it more explicit makes it clearer)
• Copy this ESLint rule which automatically removes durationInFrames={Infinity}: https://github.com/remotion-dev/remotion/blob/main/packages/eslint-plugin/src/rules/no-duration-frames-infinity.ts and make the new rule remove from={0}.