Update template slides with more 'Rabbit' features

During the development of a new theme is helpful to have the maximum possible number of Rabbit features available into template slides to understand the global theme behavior.
This commit would update the referenced slides by adding some 'Rabbit features' like place tag into title slide, text at various size, emphasized text,  'only title' slide with background image, text with footnote, text with note and title with note.
At this 'commit' the changes only affect the 'rab' file.