feat: add logo image and RTL support styles

- Added logo image to assets.
- Implemented RTL support styles in rtlSupport.scss for various components including breadcrumb, datatable, and tree node toggle button.

chore: configure environment files for production, staging, and development

- Created environment.prod.ts for production settings.
- Created environment.staging.ts for staging settings.
- Created environment.ts for local development settings.

feat: define custom theme preset

- Added presets.ts to define a custom theme preset using PrimeUIX with specific component styles and semantic colors.

chore: set up proxy configuration for local development

src/app/core/models/severity.ts

@@ -0,0 +1,9 @@
+export type TSeverity =
+  | 'success'
+  | 'secondary'
+  | 'info'
+  | 'warn'
+  | 'danger'
+  | 'contrast'
+  | undefined
+  | null;