Possibility to configure meta robots for blog tags pages

[jholze]

current behavior

all dynamic pages which are rendered by clicking on a blog tag are accessible for search bot. This is not good, because this generates a lot of not relevant links for same blog posts. At the end, the ranking of a website suffers.

expected behavior

it should be possible to configure the meta robot setting like we have integrated for the CMS and blog post to define the value for all tags

UX

• add a global setting in Setting -> Configuration -> website which will be used by default for all tags (it is not possible to do it per blog because tags have no relation to blogs)
• NTH: show it within the promote panel - but without the possibility to change it, because it has an effect for all tags ( setup per tag will come in another ticket)

[kaerdsar]

This commit also include the possibility to setup meta_robots for each tag and blog.

We still need to check what is the correct way for tag url:

• /[blog-seo-url]/tag/[tag-seo-url] or
• /[blog-seo-url]/[tag-seo-url]

[fczaja]

We take this URL

/[blog-seo-url]/[tag-seo-url]