a lot of refactoring: tag action is now handled by home view and uses sorting and pagination. Some small view enhacenments. Fix of #476, #461 for baggy and other themes

Most important in this pull request is refactoring of "tag" view. It's now handled by default by home.twig template and, so, uses sorting and pagination. On my view, it is logical step as it is in general the same list of articles and there is no reasons to handle it differently.  This also fix  #476 issue.
I have also added tag name into template as it's logical to see what we try to view.
Another enhancements  is in tag editing: Article name is added here (to see what we tag).
Also have added additional tag links at the end of article view. This is because often user decides to store and tag article directly after reading it, so additional "tag" link at the bottom is useful for this use case.
Also have added "save a link" link to baggy theme (by the way have found a lot of small bugs in this theme, for example, no sorting, will try to fix this during this week).
Plus added some small style corrections to other themes according to "save a link" in menu.