Fix Number and URL config validations

[lomky]

I rule and have completed some work on Case Manager that's ready for review!

(brief, plain english overview of your changes here)

This pull request makes the following changes:

• fixes the Numeric check for configs
• fixes the URL check for configs
• updates other information for configs in comments

Testing:

• Checked that every type of config validation is working properly in the GUI

For reviewer:

• Adjust the title to explain what it does for the notification email to the listserv.
• Tag this PR:
  • feature if it contains a feature, fix, or similar. This is anything that contains a user-facing fix in some way, such as frontend changes, alterations to backend behavior, or bug fixes.
  • dependencies if it contains library upgrades or similar. This is anything that upgrades any dependency, such as a Gemfile update or npm package upgrade.
• If it contains neither, no need to tag this PR.

[colinxfleming]

one thing to check but then go for it , thx kat

[colinxfleming]

When I put nah in here it lets me, though it seems to evaluate to zero -- I think this is because validate_number produces a string if something's up. That said it doesn't break anything on the frontend thankfully