docs: add Discord invite link to README #8

Job	Run time
build-linux / Build Linux x86_64	7m 29s
build-macos / Build macOS x86_64-apple-darwin	7m 48s
build-macos / Build macOS aarch64-apple-darwin	4m 2s
build-macos / Create Universal Binary	1m 1s
Create Release	10s
	20m 30s

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