Changed workflows categories to lowercase and removed dashes

[andraz213]

Fixes #185 and fixes potential future problems with dashes on the blog site.

Fixes #207

[andraz213]

Fixed #207 as well while I'm at it.

[andraz213]

Blog categories now show the active category. It was only implemented on the workflows site and not on the blog site, so I decided to add it.

[markotoplak]

Thanks. How did you handle old URLs? Are there any redirects if someone perhaps had an old URL bookmarked? Did you search the current site if the old URLs were used anywhere?

[andraz213]

Good point. I can change the URLs back and just change how categories are displayed.
Redirects could be implemented, but I don't know how this site is hosted.

[andraz213]

The URLs are now the same as before. Just the tags are displayed in lowercase letters.

[irgolic]

LGTM, please rebase and solve conflicts following merge of #245

@markotoplak Can you merge this, if you're okay with the aforementioned URL redirects?

[markotoplak]

@andraz213, sorry, I somehow overlooked your comment. Should be fine now, could you please rebase?

[ajdapretnar]

@markotoplak @irgolic Could we add the auto-rebase option which we have in orange3 (if I am not mistaken)?