[RFC] Implemented several components

The list of implemented components:
* signup-final-box
* signup-progress-breadcrumb
* signup-box
* login-signup-box
* search-box
* entrance-page
* navbar
* user-list-box
* post-list
* post-box
* coverphoto-box
* profile-about-box
* timeline-about-box
* new-post-box
* timeline-page
* mini-timeline-card
* timeline-list-box
* search-page

Please review.