Add implementation-details segment #6481

Job	Run time
find-languages	3s
cargo (ubuntu-latest)	30s
bare-metal (src/bare-metal/alloc-example, aarch64-unknown-none)	27s
cargo (macos-latest)	53s
bare-metal (src/bare-metal/aps/examples, aarch64-unknown-none)	25s
format	32s
Translation diff	1m 48s
bare-metal (src/bare-metal/microcontrollers/examples, thumbv7em-none-eabihf)	42s
typos	6s
bare-metal (src/exercises/bare-metal/compass, thumbv7em-none-eabihf)	45s
bare-metal (src/exercises/bare-metal/rtc, aarch64-unknown-none)	31s
build (ar)	5m 10s
build (bn)	5m 17s
build (da)	4m 29s
build (de)	5m 15s
build (el)	4m 41s
build (en)	4m 1s
build (es)	4m 57s
build (fa)	4m 34s
build (fr)	5m 18s
build (id)	5m 22s
build (it)	5m 4s
build (ja)	5m 47s
build (ko)	5m 29s
build (pl)	4m 31s
build (pt-BR)	5m 18s
build (ro)	5m 26s
build (ru)	4m 57s
build (tr)	5m 20s
build (uk)	4m 44s
build (vi)	4m 46s
build (zh-CN)	6m 15s
build (zh-TW)	5m 58s
	1h 59m 21s

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