Fix security warning in console

[marekrogala]

When you run the app, devtools console displays a warning as below. We need to fix it.

Electron Security Warning (Insecure Content-Security-Policy) This renderer process has either no Content Security
Policy set or a policy with "unsafe-eval" enabled. This exposes users of
this app to unnecessary security risks.

For more information and help, consult
https://electronjs.org/docs/tutorial/security.
This warning will not show up
once the app is packaged.

[wojdziw]

@marekrogala I'm not sure we'll be able to fix this - ptal @ anderejd/electron-wasm-rust-example#6. We seem to have a lot of WASM dependencies in yarn.lock.

[wojdziw]

WebAssembly/content-security-policy#7

[marekrogala]

Thanks for checking! that's enough for me to justify closing this issue!