[UI] Redesign to match Salesforce newest Lightning Interface Design "Cosmos"

[sagelga]

Is your feature request related to a problem? Please describe.
This is not a problem, only a request

Describe the solution you'd like
With the upcoming Salesforce newest design rolling out, I would like to propose the Salesforce Reloaded to have a similar feels when used together. Like it was built for each other. The seamless design of Salesforce and the dev tools everyone needed.

https://www.salesforce.com/blog/salesforce-cosmos-slds-2/

Describe alternatives you've considered
This request surely requires a huge change to the color palette and the overall design of Salesforce Reloaded, but it would be nice when it goes together so well.

Additional context
No additional context.