[FEATURE] [FRONTEND] Standardize bootstrap styles and UI components

[0xMurage]

Describe the user story:

Wikonnect uses Bootstrap 4 as it's primary UI kit.
Currently, bootstrap components and styles are provided by ember-bootstrap package and by CDN assets on index.html. Everything should be standardized to ensure consistency and improve/simplify updates.

The ember-bootstrap components should be utilized whenever possible. The UI kit styles should be imported from bootstrap package to ease customization.

Tasks (where applicable)

• Migrate all bootstrap.js based components to ember-bootstrap based components
• Import bootstrap styles
• Remove JQuery and bootstrap cdn assets from index.html

Acceptance Criteria

On all UI components,

• Current UI/UX functionality should be maintained
• Current UI look and feel should be maintained