graph: package wasm file

* The `graphvizlib.wasm` file provided by `@hpcc-js/wasm` needs to be
  included in `dist/js`.
* It is then loaded async by a JS script imported by the graph view.
* At the time of writing we are using Webpack 4 which doesn't seem to
  play nicely with this approach so the best solution I can come up with
  is to symlink the wasm file into the `public/js` directory.
* This symlink will be broken until you `yarn install`.
* This hack might not be needed when we upgrade to Webpack 5, however,
  this might just be due to the way HPCC packages graphviz.

Author: oliver-sanders

README.md

@@ -4,16 +4,6 @@
 
 # Cylc UI
 
-## TODO
-
-I haven't managed to configure webpack to pass through the WASM files yet
-so for the moment you have to manually copy the wasm file over into dist
-the first time you build.
-
-```bash
-cp node_modules//@hpcc-js/wasm/dist/graphvizlib.wasm dist/js/
-```
-
 ## Installation
 
 Install the [UI Server](https://github.com/cylc/cylc-uiserver) which bundles

public/js/graphvizlib.wasm

@@ -0,0 +1 @@
+../../node_modules/@hpcc-js/wasm/dist/graphvizlib.wasm