Revise 'add pin click' functionality to avoid overlay opening on map clicks

[jokroese]

I've found the new 'add pin click opens add overlay' functionality implemented in #62 pretty annoying. I now realise that previously I clicked off the map to close the moment popups. Now, each of these clicks opens the overlay. Showing the project to other people over the last few days, I've seen most people do this too, as well as clicking by accident when trying to scroll.

I suggest we get rid of this.

Instead, when we 'add pin click' on the map, it should lightly visually emphasise the add overlay button (e.g., growing slightly or a small shake) to show that with the add pin placed, the user is invited to click on the button to share the text of the moment.

[nielsbom]

Totes agree.

[jokroese]

Should we modify it to put this light emphasis on the button or remove it altogether? @queeringthemap, maybe you have opinions?

[queeringthemap]

Let's just remove it all together! It seemed to work fine before even without emphasis on the button. :)