Add LinkedIn OpenID Socialite provider

[thecrazybob]

Refer to:

• [5.x] Adds LinkedInOpenId provider laravel/socialite#662
• https://laravel.com/docs/10.x/socialite#configuration

[andrewdwallo]

Thanks! One more thing before I merge. Would it be better to just use the display name "LinkedIn" instead of "LinkedIn OpenID" for both?

[andrewdwallo]

Also, I suppose we should update composer.json to use "laravel/socialite": "^5.9" as well?

[thecrazybob]

Thanks for pointing out the version change in composer. I have bumped it to ^5.9 and renamed the provider to just LinkedIn

[andrewdwallo]

Thanks! I will be adding Slack as well soon. Thinking I will update the Twitter logo and name as well.