Feat/settings

[olgakup]

Describe your changes:

Adds Settings View and Addresses' Names list and functionality.
Migrates theme change to settings menu.
Contains changes to the store:

• deleting portfolio item will still keep it in address's names
• checks if address is already saved before adding it again

Type of change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist before requesting a review

• I have performed a self-review of my code
• I have removed hard coded strings
• I have added entry to ./changelog
• I have added pr label
• I have commented my code, particularly in hard-to-understand areas