Introduce differential rendering

[richard-jones]

• PR: [when the PR is created, put a link to it here. DO NOT use the "linked PR" feature]

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In order to remove some of the complexities introduced by complete DOM re-rendering on query cycles, and to improve certain user interactions, we should introduce differential DOM rendering, as is found in frameworks like React and Vue.

An example algoritm for implementing this:
https://dev.to/joydeep-bhowmik/virtual-dom-diffing-algorithm-implementation-in-vanilla-javascript-2324

Acceptance Criteria

• Only re-render portions of the dom that need it