Remove the current graph view and component

[kinow]

Describe exactly what you would like to see in an upcoming release

It was decided in our last meeting that the current Graph view and component are not working as expected for Cylc 8. Since we are still going to look at options for displaying the graph in the UI, we can safely remove the current version.

That will save us time having to update GraphQL queries, test the Graph view/component when other things are changed, and maintain the dependencies that come with the view/component (e.g. cytoscape & transitive deps like jquery).

You'd need to build & test the app several times, doing something like (not necessarily in this order)

• remove Graph View
• remove Graph Component
• remove any state in Vuex that was used for the Graph
• remove any mixin used for the Graph
• remove any util code used for the Graph
• remove Vue Router routes for the Graph View
• remove the GraphQL queries from the Graph (or leave them commented out, or just leave without use, but check the linter)
• remove unit & e2e tests
• remove dependencies from package.json

Additional context

The placeholder for the graph view is #74. Follow the linked issues, or search for "graph" on GitHub UI for more issues related to graph view & components — if interested.

See readme and package.json for build commands.

Pull requests welcome!