build: remove unnecessary `fly.toml` #119

Job	Run time
Release harper-ls - Windows-x86_64	4m 19s
Release harper-ls - macOS-x86_64	1m 29s
Release harper-ls - macOS-aarch64	1m 28s
Release harper-ls - Linux-x86_64-GNU	1m 34s
Release harper-ls - Linux-aarch64-GNU	2m 6s
Release harper-cli - Windows-x86_64	1m 55s
Release harper-cli - macOS-x86_64	1m 14s
Release harper-cli - macOS-aarch64	1m 3s
Release harper-cli - Linux-x86_64-GNU	59s
Release harper-cli - Linux-aarch64-GNU	1m 25s
	17m 32s

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