Change url_prefix to /conda-store

[nkaretnikov]

This is what conda-store-ui expects, which allows running conda-store-server in standalone mode without passing the config.

Fixes #646.

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[nkaretnikov]

With this PR, it's now possible to just do python -m conda_store_server.server --standalone and use the Login button on the homepage, which is served by conda-store-ui. Tested on Windows and Linux. See the issue for details and this comment conda-incubator/conda-store-ui#322 (comment).

Note: this branch is based on main, but I removed the port change commit, which prevents this from working by default, see conda-incubator/conda-store-ui#322. When this PR lands, the port issue still won't be solved, so this won't work by default. But on this particular branch everything works fine.

[costrouc]

@nkaretnikov I'm surprised this is needed. For the typical install I would expect url_prefix to be /. The only reason /conda-store is used is since this is required for deployments with multiple services under the same domain. We can meet to talk about this if you'd like?

[nkaretnikov]

Discussed this offline. A better solution would be to do this on the UI side. The /conda-store prefix exists mostly for running within Nebari.