Misc fixes to directory structure, changelog, CI #1173

Job	Run time
set-image	1s
spellcheck	9m 46s
check (STD)	8m 52s
clippy	4m 5s
clippy-examples (STD)	21m 54s
check (WASM)	3m 3s
fmt	11m 9s
clippy-examples (WASM)	13m 8s
check (RISCV)	4m 16s
dylint	4m 51s
examples-custom-test	25m 4s
examples-test (1)	9m 27s
examples-test (2)	14m 1s
examples-test (3)	14m 9s
examples-test (4)	8m 49s
examples-test (5)	10m 46s
examples-test (6)	8m 47s
test (ink)	11m 6s
build (STD)	10m 29s
test (linting)	3m 52s
build (WASM)	2m 16s
examples-docs	4m 46s
examples-contract-build (WASM, 1)	9m 44s
examples-contract-build (WASM, 2)	10m 8s
examples-contract-build (WASM, 3)	10m 57s
examples-contract-build (WASM, 4)	9m 5s
examples-contract-build (RISCV, 1)	4m 8s
docs	0s
codecov	0s
fuzz	0s
measurements / contract-sizes (master)	15m 44s
measurements / contract-sizes (pull_request)	15m 46s
	4h 40m 9s

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