Upgrade overall experience

[technowhizz]

I'm not sure if this is the best way to achieve this, but it works.

Looking further into #9 I found that the useCurrent() function was returning 0000-00-00 00:00:00 instead of CURRENT_TIMESTAMP. The same with useCurrentOnUpdate(). This should hopefully avert this.

Open to other ideas as to why this might be happening but in the meantime this should work

[technowhizz]

The changes are intended to improve the usability and functionality of the codebase.

Environment Configuration

• Added env.php to bootstrap/app.php

  Shortener Domains

• Modified LinkHelper.php to add adf.ly to the list of shortener domains

  Redirect Notice

• Modified LinkController.php to enable a redirect notice if enabled in the environment

  Link Ordering

• Modified add_link_table_indexes.php to order links by ID when chunking them

  CSS Styling

• Modified CSS for site URL field and check button in index page

  Input Validation

• Added input validation script for link URL field in index page

  Login Page Message

• Updated login page with message from environment, if enabled

  Admin Link

• Added admin link to navbar dropdown menu on small screens

[mwilmes-at-avc]

@technowhizz This patch looks great; thank you for your efforts. I have one question about database/migrations/2023_01_24_234401_add_secrets_key_default.php. The code in my repository uses Schema modification commands to remain DB agnostic. I would like to allow for other DBs to be used with POLR in the future. The update I'm seeing is an ALTER statement that only works for MySQL. I don't have much experience with Laravel; this upgrade was a knee-jerk to get to PHP 8. Do you see any technical reason that we could not keep the declarative syntax using Schema?

[technowhizz]

Will open new PR