Add option to enable linked GoogleTagManager

[khusika]

Not all users linked their GoogleAnalytics with the GoogleTagManager, add option whether to use GoogleTagManager or not. This also remove deprecated googleAnalytics config.

[khusika]

@dillonzq All things are good here, good to go.

[uPagge]

This change I moved to the new fork 😄

Since the developer has unfortunately abandoned the project 😞, I would like to take responsibility for its support and development in the future.

🔗 -> https://github.com/uPagge/uBlogger.

I focused on adding new features, refreshed the design of the posts, fixed the bugs I found.
There were so many changes (the ability to choose a separate design for the post, breadcrumbs, a new comment system and much more), and so much to do, that I decided to give the template a new name uBlogger.

Short and basic, what I have changed

I will be glad if you look at it, you may like the updated design.

[khusika]

This patch is not relevant anymore as of this changes gohugoio/hugo@ba16a14.
Use Hugo internal template instead.