feature: Loading from the landing page, viewer page routing

[ShrimpCryptid]

Estimated review size: medium, 30-40 minutes

Closes #188, the landing page implementation!

This change finishes implementing loading from the landing page and also sets up routing for the app.

These changes seem large, but the majority of the changes are just file moves and renames! I'll note what files you can compare between, and a summary of any changes on each file.

Changes:

• Adds react-router-dom and routes for the landing page (at root URL, /) and viewer (/viewer).
• The landing page can now redirect to the viewer when a Load button is clicked, and passes the app arguments as state through the navigation API.
• Renamed the landing-page directory to website, since it now includes several website-related components.
• Adds a new AppWrapper component, which wraps ImageViewerApp.
  • Handles retrieving app arguments from URL or from routing.
• Moves the URL parsing logic to url_utils.tsx.

Videos (🔊)

Browser Router:

https://github.com/allen-cell-animated/website-3d-cell-viewer/assets/30200665/176cc000-384f-4e75-a5cf-8cc471499f0a

Hash Router:

https://github.com/allen-cell-animated/website-3d-cell-viewer/assets/30200665/51920aa7-e427-4793-b973-4cc85ff7fd72

Loading empty viewer:

Validation:

1. Run the app locally. The default URL should open on the landing page.
2. Click on the "Load" button, and it should open the volume in the /viewer page.
3. Refreshing the page should still show the same volume.
4. Go to http://localhost:9020/viewer?url=https://animatedcell-test-data.s3.us-west-2.amazonaws.com/20200323_F01_001/P13-C4.zarr . This should also open correctly in the browser.
5. Go to http://localhost:9020?url=https://animatedcell-test-data.s3.us-west-2.amazonaws.com/20200323_F01_001/P13-C4.zarr . This will redirect to the /viewer page.

[ShrimpCryptid]

good to delete yes, but wondering how we can get test data like this into the viewer during dev. These settings are basically how we want the variance dataset to be presented in the viewer.

Can't respond directly to this for some reason, but I did end up adding props for the AppWrapper component where this could be overridden. You could also edit LandingPage/content.ts to add a button for whatever test data you're working with, or include it via the URL?

[ShrimpCryptid]

Leaving further refactor of project until #215.