More common components into Storybook

[eyeseast]

This adds four more components into Storybook. These all depend on the router, so my goal is to figure out whether we can make them stateless.

src/common/dialog/SearchTipsDialog.svelte had one Link component, which is now an a tag. It still relies on the orgsAndUsers store in order to check if the current user is logged in, and use that to write an example search.

src/common/ErrorData.svelte uses the nav helper to turn route names into URLs.

src/common/Logo.svelte has a surprising amount of logic in it. This should really just be an icon that gets wrapped in a link, and that logic should be outside the component.

src/common/HtmlField.svelte gets used in the viewer, as text entry. Will probably make a new version in SvelteKit when we have more form handling options.

src/common/Dropdown.svelte should just get replaced with src/common/Dropdown2.svelte.

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