Misc fixes to directory structure, changelog, CI #1174

Job	Run time
set-image	1s
fmt	11m 19s
clippy	10m 1s
clippy-examples (STD)	23m 9s
check (STD)	14m 47s
clippy-examples (WASM)	13m 36s
check (WASM)	8m 41s
spellcheck	9m 56s
dylint	10m 31s
check (RISCV)	10m 15s
examples-test (1)	9m 20s
examples-custom-test	25m 29s
examples-test (2)	14m 16s
examples-test (3)	13m 56s
examples-test (4)	9m 11s
examples-test (5)	10m 59s
examples-test (6)	8m 50s
test (ink)	17m 57s
build (STD)	16m 38s
test (linting)	10m 23s
build (WASM)	8m 45s
codecov	22m 19s
docs	17m 16s
examples-docs	11m 16s
examples-contract-build (WASM, 1)	16m 5s
examples-contract-build (WASM, 2)	16m 30s
examples-contract-build (WASM, 3)	17m 13s
examples-contract-build (WASM, 4)	15m 36s
examples-contract-build (RISCV, 1)	10m 29s
fuzz	0s
measurements / contract-sizes (master)	31m 28s
measurements / contract-sizes (pull_request)	31m 46s
	7h 27m 58s

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