Fix community's website button and cover photo

[henriquecbuss]

What issue does this PR close

Closes N/A

Changes Proposed ( a list of new changes introduced by this PR)

• Automatically include https:// to community's website if they don't provide it
• Change default cover photo to use SVGs
• Show actions as completed on the claim cards (the ones in the analysis page and in the dashboard)

How to test ( a list of instructions on how to test this PR)

• Edit a community to have a website, but don't include https:// in front of it. If you now log out and go to the "Join" page, you should be able to click the "Visit the website" button and be redirected to the correct website
• Go to a community that doesn't have a cover photo (e.g. cambiatus), and see if the right one shows up (note that they're slightly different imgs for desktop and mobile - the mobile one is wider)
• Look for a claim from a completed action that was still pending, and see if it shows as "Completed" instead of "Under Review"

Additional context

• URL issue reported on Slack by @muguika for the Ticolones community on demo
• Change cover photo to SVGs requested by @rafachadud on Slack
• Completed action status requested by @juramos-2020 on Slack

[henriquecbuss]

@lucca65, @juramos-2020 asked for some prints from some features, and one of them was to show the action as completed in the claim cards (the ones in the analysis page and in the dashboard), and I realized that wasn't a thing! It's a quick fix, so I just put it in this PR as well, since it's filled with tiny fixes that should be live before the update 😅

[lucca65]

💣 🔥 !!