Get rid of the dataPath in the examples and tests

[adamnovak]

We no longer use the dataPath field on view targets, but it is still set on the examples in config.js and still checked in the link to view tests. We should get rid of it and only use the one global dataPath.

[adamnovak]

We have two concepts of a dataPath: the one at the top level of config.json which specifies where to find the exampleData directory (and which we still use), and the one inside the ViewTarget (which doesn't seem to be used anymore).

We want to get rid of the one that is inside of a view target/data source, and keep only the concept of a top level config dataPath which is just where all the example data lives.

So we want to keep:

• The discussion of dataPath in the README
• https://github.com/vgteam/sequenceTubeMap/blob/f4ab3c27dd53fc0ce0627d6a4885269378eb75ba/src/config.json#L51
• https://github.com/vgteam/sequenceTubeMap/blob/f4ab3c27dd53fc0ce0627d6a4885269378eb75ba/src/server.mjs#L45
• https://github.com/vgteam/sequenceTubeMap/blob/f4ab3c27dd53fc0ce0627d6a4885269378eb75ba/docker/config.json#L50

And we want to get rid of:

• https://github.com/vgteam/sequenceTubeMap/blob/f4ab3c27dd53fc0ce0627d6a4885269378eb75ba/src/Types.ts#L4-L6
• The dataPath entries in DATA_SOURCES like: https://github.com/vgteam/sequenceTubeMap/blob/f4ab3c27dd53fc0ce0627d6a4885269378eb75ba/src/config.json#L10
• And similarly in the config for Docker containers: https://github.com/vgteam/sequenceTubeMap/blob/f4ab3c27dd53fc0ce0627d6a4885269378eb75ba/docker/config.json#L10
• The reference to dataPath in the comment here: https://github.com/vgteam/sequenceTubeMap/blob/f4ab3c27dd53fc0ce0627d6a4885269378eb75ba/src/App.js#L70-L72
• The dataPath field in the expected link for the tests here: https://github.com/vgteam/sequenceTubeMap/blob/f4ab3c27dd53fc0ce0627d6a4885269378eb75ba/src/end-to-end.test.js#L342