Drop brewfile, drop makefile, update readme and documentation (#2205)

* Drop brewfile, drop makefile, update readme
* Minor grammar and consistency fixes
* ReadMe: add more documentation links, cleanup layout
* ReadMe: cleanup and contribution section. Roadmap: update.
* Docs: Lots of minor fixes

Co-authored-by: Anna Prosvetova <anna@prosvetova.me>
Co-authored-by: Astra <astra@astrra.space>

documentation/RoadMap.md

@@ -0,0 +1,49 @@
+# RoadMap
+
+# Where we are (0.x.x branch)
+
+Our goal for 0.x.x branch is to build stable, usable apps and API.
+The first public release in this branch is 0.43.1.
+
+## What's already implemented
+
+**System and HAL**
+
+- Furi Core
+- Furi HAL
+- Loading applications from SD
+
+**Applications**
+
+- SubGhz: all most common protocols, reading RAW for everything else
+- 125kHz RFID: all most common protocols
+- NFC: reading/emulating Mifare Ultralight, reading MiFare Classic and DESFire, basic EMV, basic NFC-B/F/V
+- Infrared: all most common RC protocols, RAW format for everything else
+- GPIO: UART bridge, basic GPIO controls
+- iButton: DS1990, Cyfral, Metacom
+- Bad USB: Full USB Rubber Ducky support, some extras for windows alt codes
+- U2F: Full U2F specification support
+
+**External applications**
+
+- Bluetooth
+- Snake game
+
+# Where we're going (Version 1)
+
+The main goal for 1.0.0 is to provide the first stable version for both Users and Developers.
+
+## What we're planning to implement in 1.0.0
+
+- More protocols (gathering feedback)
+- User documentation (work in progress)
+- FuriHal: deep sleep mode, stable API, examples, documentation (work in progress)
+- Application improvements (a ton of things that we want to add and improve that are too numerous to list here)
+
+## When will it happen, and where can I see the progress?
+
+Release 1.0.0 will most likely happen around the end of 2023Q1
+
+Development progress can be tracked in our public Miro board:
+
+https://miro.com/app/board/uXjVO_3D6xU=/?moveToWidget=3458764522498020058&cot=14