We have a native dependency, Rinku, that's used only to make links in one place. We can get rid of this and use PrettyText instead.
This is almost a one-for-one replacement, but PrettyText adds rel="noopener nofollow ugc" to external links, which I suspect is actually what we want. It also wraps the result in a <p> tag, which we strip out for parity with Rinku.
Twitter removed OpenGraph tags from their pages. We can no longer
extract all the information (for example, the quoted tweet) we need
to render Oneboxes without using their API.
This avoids the samesite cookie related error on chrome. It also adds support for twitter 'GIF' content, and allows videos to resize smoothly for narrow devices.
We have the `# frozen_string_literal: true` comment on all our
files. This means all string literals are frozen. There is no need
to call #freeze on any literals.
For files with `# frozen_string_literal: true`
```
puts %w{a b}[0].frozen?
=> true
puts "hi".frozen?
=> true
puts "a #{1} b".frozen?
=> true
puts ("a " + "b").frozen?
=> false
puts (-("a " + "b")).frozen?
=> true
```
For more details see: https://samsaffron.com/archive/2018/02/16/reducing-string-duplication-in-ruby
This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.
Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging
