Remove panic handler example from core crate

Makefile

diff --git a/Makefile b/Makefile
index 7d87c28..3e97e22 100644
--- a/Makefile
+++ b/Makefile
@@ -45,7 +45,6 @@
 	PLATFORM=nrf52 cargo build --release --target=thumbv7em-none-eabi --example panic --features=custom_panic_handler,custom_alloc_error_handler
 	PLATFORM=nrf52 cargo build --release --target=thumbv7em-none-eabi --example alloc_error --features=alloc,custom_alloc_error_handler
 	PLATFORM=opentitan cargo build --release --target=riscv32imc-unknown-none-elf --examples # Important: This is testing a platform without atomics support
-	cd core && cargo build --release --target=thumbv7em-none-eabi --examples --features=custom_panic_handler && cd ..
 
 .PHONY: test
 test:

core/Cargo.toml

diff --git a/core/Cargo.toml b/core/Cargo.toml
index f0477eb..64fa96e 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -11,8 +11,3 @@
 
 [dependencies]
 linked_list_allocator = { optional = true, version = "=0.6.5", default-features = false }
-
-[[example]]
-name = "custom_panic"
-path = "examples/custom_handler.rs"
-required-features = ["custom_panic_handler"]
\ No newline at end of file

core/examples/custom_handler.rs

diff --git a/core/examples/custom_handler.rs b/core/examples/custom_handler.rs
deleted file mode 100644
index 8cccca9..0000000
--- a/core/examples/custom_handler.rs
+++ /dev/null
@@ -1,12 +0,0 @@
-#![no_std]
-
-use libtock_core::result::CommandError;
-
-fn main() -> Result<(), CommandError> {
-    panic!("Bye world!");
-}
-
-#[panic_handler]
-unsafe fn panic_handler(_info: &core::panic::PanicInfo) -> ! {
-    loop {}
-}