refactor: Moving layer control button to always be with the rest of the map controls

[popkinj]

• Removing old layer control button in the top right
• Always show smaller layer control button, bottom right
• Layer menu behaves like the other leaflet controls so it moves accordingly when the sidebar is expanded.
• In mobile mode the layer menu opens in the bottom tray as before.

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[kdbelair]

@popkinj looks good! a couple notes:

• I think we lost some text below "All data layers sourced from GeoBC." Can we include the following updated text with this new link: "Click here to learn more about map layers" https://www2.gov.bc.ca/gov/content?id=703C452C2F8C4B0095AF39CA59B9D1A2

• Are we updating the basemap icon as part of this PR?

• The clipping issue on mobile for the top toolbar is still present:
  

• There is a clipping issue on mobile for the basemap selector. Screenshot from my device:

Screenshot from desktop:

[popkinj]

Ah yes... I removed that link because it was going to the now deprecated /guidance link. I fix that.
And yea, I can update the basemap icon. Think we agreed on a globe right?

[kdbelair]

Ah yes... I removed that link because it was going to the now deprecated /guidance link. I fix that. And yea, I can update the basemap icon. Think we agreed on a globe right?

Yes, we agreed on a globe

[popkinj]

[popkinj]