adding tutorial count to tags

[Bhupesh-V]

Is your feature request related to a problem? Please describe.
It would be nice to indicate no.of tutorials on each tag on the Tags Page.

Describe the solution you'd like
A nice counter attached with each tag showing tutorial count.

Issue raised by José Devezas on DEV.to

[sonicaks]

New PR: #65

[Bhupesh-V]

@sonicaks first of all thanks for the PR
But the current approach is not efficient because we are storing a redundant column in the table instead of querying.
Have a look at this thread on SO and see if we can do the same.

[sonicaks]

Ok. I get the problem. I'll try with another pull request implementing the annotate method

[sonicaks]

@Bhupesh-V any update with PR #65