Move all firmware files to subdirectory

firmware/main/Kconfig.projbuild

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+menu "Bedside clock settings"
+     menu "Default settings"
+          config DEFAULT_HOSTNAME
+                 string "Default hostname"
+                 default "bedside-clock"
+          config DEFAULT_SSID
+                 string "SSID of default WiFi network"
+                 default ""
+          config DEFAULT_PSK
+                 string "PSK for default WiFi network"
+                 default ""
+          config DEFAULT_TIMEZONE
+                 string "Default timezone (TZ format)"
+                 default "UTCUTC-1,M3.5.0/1,M10.5.0/2"
+          config DEFAULT_SNTP_SERVER
+                 string "Default SNTP server domain"
+                 default "pool.ntp.org"
+     endmenu
+     menu "Alert sound options"
+          config ALERT_FREQ
+                 int "Frequency (in Hz) of the alert sound"
+                 default 400
+          config ALERT_AMPLITUDE
+                 int "Amplitude (0 to 255) of the alert sound"
+                 default 180
+          config ALERT_TOGGLE_PERIOD_MS
+                 int "Toggle period of alert sound in milliseconds"
+                 default 300
+     endmenu
+     config ALERT_MINUTES
+            int "Number of minutes before alarm turned off automatically"
+            default 2
+     config SNOOZE_MINUTES
+            int "Number of minutes to snooze alarms for"
+            default 5
+     config WIFI_MAX_RETRIES
+            int "Maximum number of times to retry connecting to WiFi network"
+            default 10
+     config TIME_SAVE_PERIOD_MS
+            int "How often (in ms) to save the time to persistent storage"
+            default 60000
+     config DEFAULT_TASK_STACK
+            int "Default task stack size (in words)"
+            default 4096
+     config MAX_ALARMS
+            int "Maximum number of alarms"
+            default 16
+endmenu