Redo Show page with Tailwind

[ClaireDMT]

What does this PR do?

• update issues#show view with Tailwind instead of Bootrap
• created a @apply rule for the button not to have to re-write the long list of classes (cf tailwing.css) doc for @apply
• updated the seeds to remove the obsolete columns from the user creation after implementation of OmniAuth

Related issue

https://github.com/Contributees/First-Ruby-Quest/issues/32

Screenshots

remarks

I tried to use the same kind of configuration that bootstrap provides to style form by default. That was impossible as Tailwind generates the CSS/classes by scanning the HTML content . I f needed, we can use the Rails FormBuilder feature to build forms with specified classes or options. I think that is better than the small gem generation simple_form with tailwind