Allow for updating zebrad config from within app, listen for and preserve logs across routes

[arya2]

Motivation

• Updating the config without editing files outside the app and restarting the app
• Displaying the config that's being used

Solution

• Removes the config form
• Generate a default config if none exists already
• Displays the config file with syntax highlighting (using highlight.js, only works for displaying the config)
• Adds a textarea for editing the config file directly
• Restarts Zebrad when a new config file is saved
• Returns the old config in case the new config is invalid (there's no validation yet)
• Waits a few seconds for the webview to start reading events before emitting the logs

Follow Up Work

• Check if the zebrad exits because of an invalid config, replace the new config with the old config and restart zebrad again?
• Avoid scrolling to the bottom of the page unless it's the logs page
• Fix duplicate logs issue when saving a new config and restarting Zebra

[arya2]

Preview: