Run CoExpNetViz locally instead of through the website
CoExpNetViz is not computationally intensive, plus it's better for privacy/security if a user doesn't need to upload files to our server; this also avoids GDPR I guess. So it would be better if instead we could include CoExpNetViz inside the plugin, or require users to install it along side it, and then configure the plugin to call it. The latter is probably more flexible, allowing e.g. running it in Docker.