Mobile layout optimisations

## Description

- Many users - particularly in developing regions - only have a means of access to the internet via a phone.
- Many **first-time** internet users, especially in low- and middle-income countries, "leapfrog" desktop/laptop computing and instead adopt mobile phone immediately [source](https://www.bis.org/publ/work1166.pdf)
- With that in mind, it's quite likely that users of stac-map will access from a mobile device at some point.
- It would be great if Chakra can support mobile optimisations, including collapsing the expanded stac catalogue search on the left side, perhaps into a sidebar?

## stac-map link

https://imagery.hotosm.org

## Screenshot