Add Jump forward a page, jump backward a page to read aloud toolbar

**Description**

For users who only listen to the audio, it is annoying to only jump forward/back tiny distances. Add buttons for jumping forward/back more; 1 page.

**Evidence / Screenshot (if possible)**

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**Expectation**

> What should be happening? What will it look like / how will it behave when fixed?

**Context**

> What operating system? What browser type and version?

**Proposal & Constraints**

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**Stakeholders**

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