Always rebuild and deploy the frontend

Setting the `ignore` value to `false` means that the `false` program
(which always exits with non-zero code) will cause Netlify to always
rebuild the frontend, even if there are no changes to the code. We want
to do this because in fact the *git tag* that is installed as part of
our deployment process *always* changes, and we need to reflect that
version number in the frontend application itself.

web/netlify.toml

@@ -1,6 +1,7 @@
 [build]
 publish = "dist"
 command = "yarn run build"
+ignore = "false"
 
 # Staging
 [context.master.environment]