Automatically generate shareable links when adding a new link to the database

## Current

When a new article is indexed, one has to manually go in to create shareable links to the article.

## Expected

When a new article is indexed, it would be great if it generated three shareable links

## Details

Linked should be shortened with Rebrandly and the parameters should always follow the same pattern (described below)

For an article like: https://www.fastruby.io/blog/rails/tips-for-upgrading-rails-3-2-to-4.html

The shareable links should have these parameters:

### Twitter

utm_source=Twitter
utm_medium=Organic
utm_campaign=Blogpromo
utm_term=tips-for-upgrading-rails-3-2-to-4
utm_content=Textonly

### LinkedIn

utm_source=LinkedIn
utm_medium=Organic
utm_campaign=Blogpromo
utm_term=tips-for-upgrading-rails-3-2-to-4
utm_content=Textonly

### Mastodon

utm_source=Mastodon
utm_medium=Organic
utm_campaign=Blogpromo
utm_term=tips-for-upgrading-rails-3-2-to-4
utm_content=Textonly