Align viewer with altair repo

[mattijn]

This PR:

• align the INLINE_HTML variable with the current Altair repo counterpart

[jakevdp]

Have you tested this? We don't have any automated test coverage of javascript rendering, so it will be important to test manually.

In particular, I'm concerned about the removal of the code that strips js from the paths when running under requirejs. Are you certain that's no longer necessary?

[mattijn]

I've tested locally, but I can understand if we want to test this more scrupulously in different environments.

[joelostblom]

Since Altair 5.3, the functionality of Altair Viewer is now available in Altair via the vl-convert package instead. See the docs on how to use the browser renderer to display charts via .show(), and the PR vega/altair#3379 for more details.

We are going to archive this repo, so I'm closing all the open issues and PRs before doing so. Try out the new options for rendering charts mentioned above and if you run into issues, please open an issue directly in the altair or vl-convert repo.