Fix flash

[bflatau]

I took the alert flash out of the whole app and applied to just the home page. I don't think it's needed to once a user logs in. I left it as-is for when a user first registers. I feel like the subsequent layout updates will help determine the best location for the register message.

This includes my edits for a previous hacktoberfest issue.

[nskins]

Hey @bflatau! First of all, thanks for the PR! I think I'm looking for the alert to pop a little more. I want the user's attention directed to it whenever it appears. One idea I had was a toast notification of some sort. Maybe it appears at the top right of the screen for ~5 seconds? Also, we'll need to consider the alert-danger as well. So far, you've only updated alert-info.

In addition, we do need to consider the other screens as well (not just the home page). If you search for the function put_flash in the project, it shows up in various locations. Like if someone tries to access /items before logging in, it will create a danger alert on the login page (that's broken right now because my auth_form.html.heex doesn't show alerts yet).

This issue is a bit complex, so don't worry about it if it's more than you're bargaining for. I'd have to do quite a bit of research myself to figure out a good implementation...

[bflatau]

Hey @nskins my pleasure! Yeah, I figured this was more complicated ha. I'll leave it alone for now. Let me know if you have any direction for the tailwind stuff or anything else I can contribute.

Thanks!

--Ben