Hide unrelated context menu in webview

[catalinmiron]

Hi,

Thanks for creating this nice application. I was wondering if the Reload and Inspect should be hidden from the chat window.

Because after clicking on Reload this happens:

[zcbenz]

Currently we are just using the default context menu of webview, hiding the default menu is easy but we also have to implement context menus like Copy/Paste, which is quite a lot of work.