Added styles and content for the notifications

Signed-off-by: Niel Patrick M. Lugpatan <logi.ebil@outlook.com>
Added the images

Signed-off-by: Niel Patrick M. Lugpatan <logi.ebil@outlook.com>
Enhance subscription procedure adding several error handlings. 2 error handlings remaining. But still needs further testing.
Merge branch 'development' into x
Added console debugs on socket listeners.
Temporarily remove showing of error prompt on server error.