Adds link and modal to the search help

[laniehei]

What

This adds a link to pop up a modal to help instruct on the new search feature.

Why

This addresses part of issue #127

Ensure the following interactions work as expected. Please test using a mobile form factor.

• [x] Tapping on a marker on the map displays information about the marker in a popup.
• [x] Tapping the "Show list of locations" button replaces the map view with a list view.
• [x] Tapping an item in the list replaces the list view with a map view, and navigates the map to the tapped item on the map.
• [x] Tapping one of the ✅'s in the legend filters items on the map and in the list.
• [x] Changing the language to spanish changes things on the page.
• [x] Clicking the X Close button on the Help/Info screen closes the modal.
• [x] Clicking the search help link opens and closes a menu with information.
• [x] Clicking the X Close button on the search help screen closes the modal.

Check the app in the following web browsers:

• [x] Chrome
• [ ] Firefox
• [ ] Edge
• [x] Safari

Additional Notes

Does not have the new search code included. Do not merge without the search code.

[crhistianramirez]

Thank you very much!! <3

I think we might want to merge my search functionality stuff into this branch before this PR gets merged so that it gets deployed all at once.

I made a PR to this branch here: https://github.com/Twin-Cities-Mutual-Aid/twin-cities-aid-distribution-locations/pull/139

[crhistianramirez]

Blocked until this PR is merged https://github.com/Twin-Cities-Mutual-Aid/twin-cities-aid-distribution-locations/pull/144

[crhistianramirez]

This is no longer blocked as https://github.com/Twin-Cities-Mutual-Aid/twin-cities-aid-distribution-locations/pull/156 has been merged