Reading list: add number of items in the header

[rhymes]

Is your feature request related to a problem? Please describe.

From the homepage it is possible to see how many items there are in the reading list.
Once inside https://dev.to/readinglist that information is not accessible

Describe the solution you'd like

Add the number of articles in the title.

From the current

to something like

Additional context

This number has to update anytime an item is removed or archived I guess

[andrewrod33]

Currently, the home page shows the total amount of all articles (including Archived). Would this show that number or only the non-archived count?

[rhymes]

@andrewrod33 good point, I think it should list the number of non archived, and then in the https://dev.to/readinglist/archive page it should show the number of archived posts

[bolariin]

if there are no items in the reading list would the count be absent or zero?

[rhymes]

@bolariin good question. I'd replicate the logic for the reading list count of the homepage:

https://github.com/thepracticaldev/dev.to/blob/7f2045b25004e771e26112e9b3d08992b3af3245/app/assets/javascripts/initializers/initializeReadingListIcons.js#L32-L43

which seems to be: (empty) or (15) for example