[FL-2052] New build system based on scons (#1269)

ReadMe.md

@@ -25,6 +25,12 @@ Flipper Zero's firmware consists of two components:
 
 They both must be flashed in order described.
 
+## With offline update package
+
+`./fbt --with-updater updater_package`
+
+Copy the resulting directory to Flipper's SD card and navigate to `update.fuf` file in Archive app. 
+
 ## With STLink
 
 ### Core1 Firmware
@@ -36,17 +42,7 @@ Prerequisites:
 - [arm-gcc-none-eabi](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads)
 - openocd
 
-One liner: `make flash`
-
-### Core2 flashing procedures
-
-Prerequisites:
-
-- Linux / macOS
-- Terminal
-- STM32_Programmer_CLI (v2.5.0) added to $PATH
-
-One liner: `make flash_radio`
+One liner: `./fbt firmware_flash`
 
 ## With USB DFU 
 
@@ -56,7 +52,6 @@ One liner: `make flash_radio`
  - Press and hold `← Left` + `↩ Back` for reset 
  - Release `↩ Back` and keep holding `← Left` until blue LED lights up
  - Release `← Left`
-<!-- ![Switch to DFU sequence](https://habrastorage.org/webt/uu/c3/g2/uuc3g2n36f2sju19rskcvjzjf6w.png) -->
 
 3. Run `dfu-util -D full.dfu -a 0`
 
@@ -74,7 +69,7 @@ One liner: `make flash_radio`
 ## Compile everything
 
 ```sh
-docker-compose exec dev make
+docker-compose exec dev ./fbt
 ```
 
 Check `dist/` for build outputs.
@@ -85,6 +80,8 @@ If compilation fails, make sure all submodules are all initialized. Either clone
 
 # Build on Linux/macOS
 
+Check out `documentation/fbt.md` for details on building and flashing firmware. 
+
 ## macOS Prerequisites
 
 Make sure you have [brew](https://brew.sh) and install all the dependencies:
@@ -127,7 +124,7 @@ heatshrink has to be compiled [from sources](https://github.com/atomicobject/hea
 ## Compile everything
 
 ```sh
-make
+./fbt
 ```
 
 Check `dist/` for build outputs.
@@ -138,7 +135,7 @@ Use **`flipper-z-{target}-full-{suffix}.dfu`** to flash your device.
 
 Connect your device via ST-Link and run:
 ```sh
-make whole
+./fbt firmware_flash
 ```
 
 # Links
@@ -158,7 +155,6 @@ make whole
 - `documentation`   - Documentation generation system configs and input files
 - `firmware`        - Firmware source code
 - `lib`             - Our and 3rd party libraries, drivers and etc...
-- `make`            - Make helpers
 - `scripts`         - Supplementary scripts and python libraries home
 
 Also pay attention to `ReadMe.md` files inside of those directories.