Add button to reset district map to initial view

Adds a home button to the zoom controls in the district map to reset the pan and zoom level to the initial position.

I, the author of this PR checked the following requirements for good software quality:

[x] The code is properly formatted (I ran the formatter)
[x] The code is written with our software quality standards (I ran the linter)
[x] The code is written using our code style
[x] Extensive in source documentation has been added
[x] I tried addressing all new accessibility problems displayed in the console and documented if they can't be fixed
[x] I added the changes to the next release section of the changelog

I, the reviewer checked the following things:

[x] I ran the software once and tried all new and related functionality to this PR
[x] I looked at all new and changed lines of code and commented on possible problems
[x] I read the added documentation and checked if it is understandable and clear
[x] I checked the added tests for completeness
[x] I checked the internationalized strings for spelling errors
[x] I checked the performance metrics for problems or unexplained degradation
[x] I checked that the changes are noted in the changelog

DLR-SC / ESID