Implement UI MVP

[bzurkowski]

Tracking issue for discussion regarding UI MVP.

The picture below presents the agreed design for the first iteration:

Key implementation items:

• Dashboard skeleton: navbar, details box (on the left), graph area, bottom bar.
• Graph visualization in D3.js - layout options discussed in (OpenRCA graph structure #4).
• Alerts highlighting (Highlight alerts #38).
• Basic graph styling (Add styling to graph nodes #5).
• Details box with JSON viewer for entity properties (pod name, namespace, volumes) (Add object details box #25).
• Datetime picker (bottom bar) to query state of the graph in time (Add datetime picker #26).
• On-demand graph reloading (Add on-demand graph reloading #40).
• Filtering graph by app namespace (Add graph filtering by app namespace #30).
• Logo and favicon.

[bzurkowski]

MVP completed. @k-jano @filwie Thanks for your efforts. Great work! 🥇