Merge branch '31-fr-21-dark-light-mode-appearance-switch' into 'main'

assets/css/app.css

assets/js/app.js

assets/js/theme.js

assets/tailwind.config.js

features/config.exs

features/contexts/dark_mode_context.exs

features/dark_mode.feature

lib/proptrackr_web/components/core_components.ex

lib/proptrackr_web/components/layouts/app.html.heex

lib/proptrackr_web/components/layouts/root.html.heex

...ptrackr_web/controllers/my_favorites_html/index.html.heex

...trackr_web/controllers/my_properties_html/index.html.heex

lib/proptrackr_web/controllers/properties_html/new.html.heex

...proptrackr_web/controllers/properties_html/show.html.heex