Readme: update target (#768)

Co-authored-by: あく <alleteam@gmail.com>

ReadMe.md

@@ -73,26 +73,26 @@ One liner: `./flash_core1_main.sh`
 ## Compile bootloader
 
 ```sh
-docker-compose exec dev make -j$(nproc) -C bootloader TARGET=f6
+docker-compose exec dev make -j$(nproc) -C bootloader
 ```
 
 Bootloader compilation results:
-* `bootloader/.obj/f6/bootloader.elf`
-* `bootloader/.obj/f6/bootloader.hex`
-* `bootloader/.obj/f6/bootloader.bin`
-* **`bootloader/.obj/f6/bootloader.dfu`** - should be used to flash
+* `bootloader/.obj/f7/bootloader.elf`
+* `bootloader/.obj/f7/bootloader.hex`
+* `bootloader/.obj/f7/bootloader.bin`
+* **`bootloader/.obj/f7/bootloader.dfu`** - should be used to flash
 
 ## Compile firmware
 
 ```sh
-docker-compose exec dev make -j$(nproc) -C firmware TARGET=f6
+docker-compose exec dev make -j$(nproc) -C firmware
 ```
 
 Firmware compilation results:
-* `firmware/.obj/f6/firmware.elf`
-* `firmware/.obj/f6/firmware.hex`
-* `firmware/.obj/f6/firmware.bin`
-* **`firmware/.obj/f6/firmware.dfu`** - should be used to flash
+* `firmware/.obj/f7/firmware.elf`
+* `firmware/.obj/f7/firmware.hex`
+* `firmware/.obj/f7/firmware.bin`
+* **`firmware/.obj/f7/firmware.dfu`** - should be used to flash
 
 ## Concatenate bootloader and firmware
 
@@ -103,19 +103,19 @@ That's exactly how we generate our `full` builds.
 1. Concatenate HEX files:
    ```sh
    docker-compose exec dev srec_cat \
-    bootloader/.obj/f6/bootloader.hex -Intel \
-    firmware/.obj/f6/firmware.hex -Intel \
-    -o firmware/.obj/f6/full.hex -Intel
+    bootloader/.obj/f7/bootloader.hex -Intel \
+    firmware/.obj/f7/firmware.hex -Intel \
+    -o firmware/.obj/f7/full.hex -Intel
    ```
 2. Convert HEX to DFU:
    ```sh
    docker-compose exec dev hex2dfu \
-    -i firmware/.obj/f6/full.hex \
-    -o firmware/.obj/f6/full.dfu \
-    -l "Flipper Zero F6"
+    -i firmware/.obj/f7/full.hex \
+    -o firmware/.obj/f7/full.dfu \
+    -l "Flipper Zero F7"
    ```
 
-Finally, you will have **`firmware/.obj/f6/full.dfu`** file that can be distributed and flashed.
+Finally, you will have **`firmware/.obj/f7/full.dfu`** file that can be distributed and flashed.
 
 # Links
 * Discord: [flipp.dev/discord](https://flipp.dev/discord)