Move bootloader main to examples

This should remove some confusion around embassy-boot-* being a library
vs. a binary. The binary is now an example bootloader instead.

embassy-boot/nrf/Cargo.toml

@@ -2,11 +2,12 @@
 edition = "2021"
 name = "embassy-boot-nrf"
 version = "0.1.0"
-description = "Bootloader for nRF chips"
+description = "Bootloader lib for nRF chips"
+
+[lib]
 
 [dependencies]
 defmt = { version = "0.3", optional = true }
-defmt-rtt = { version = "0.3", optional = true }
 
 embassy = { path = "../../embassy", default-features = false }
 embassy-nrf = { path = "../../embassy-nrf", default-features = false, features = ["nightly"] }
@@ -28,35 +29,3 @@ defmt = [
 softdevice = [
     "nrf-softdevice-mbr",
 ]
-debug = ["defmt-rtt"]
-
-[profile.dev]
-debug = 2
-debug-assertions = true
-incremental = false
-opt-level = 'z'
-overflow-checks = true
-
-[profile.release]
-codegen-units = 1
-debug = 2
-debug-assertions = false
-incremental = false
-lto = 'fat'
-opt-level = 'z'
-overflow-checks = false
-
-# do not optimize proc-macro crates = faster builds from scratch
-[profile.dev.build-override]
-codegen-units = 8
-debug = false
-debug-assertions = false
-opt-level = 0
-overflow-checks = false
-
-[profile.release.build-override]
-codegen-units = 8
-debug = false
-debug-assertions = false
-opt-level = 0
-overflow-checks = false