docs: restructure documentation and optimize README #25

Job	Run time
Ubuntu \| NDK-r27c \| cmake \| with-ffmpeg \| 4kb	4m 19s
Ubuntu \| NDK-r26d \| cmake \| no-ffmpeg \| 16kb	2m 42s
Ubuntu \| NDK-r27c \| ndk-build \| with-ffmpeg \| 4kb	1m 59s
Ubuntu \| NDK-r26d \| cmake \| with-ffmpeg \| 16kb	2m 48s
Ubuntu \| NDK-r26d \| cmake \| with-ffmpeg \| 4kb	2m 48s
Ubuntu \| NDK-r27c \| ndk-build \| no-ffmpeg \| 16kb	1m 47s
Ubuntu \| NDK-r27c \| ndk-build \| with-ffmpeg \| 16kb	1m 53s
Ubuntu \| NDK-r26d \| ndk-build \| with-ffmpeg \| 4kb	2m 31s
Ubuntu \| NDK-r27c \| cmake \| no-ffmpeg \| 16kb	2m 47s
Ubuntu \| NDK-r26d \| cmake \| no-ffmpeg \| 4kb	2m 56s
Ubuntu \| NDK-r27c \| cmake \| no-ffmpeg \| 4kb	3m 3s
Ubuntu \| NDK-r26d \| ndk-build \| no-ffmpeg \| 16kb	1m 58s
Ubuntu \| NDK-r27c \| ndk-build \| no-ffmpeg \| 4kb	1m 46s
Ubuntu \| NDK-r26d \| ndk-build \| with-ffmpeg \| 16kb	1m 55s
Ubuntu \| NDK-r26d \| ndk-build \| no-ffmpeg \| 4kb	38s
Ubuntu \| NDK-r27c \| cmake \| with-ffmpeg \| 16kb	3m 0s
Lint	-5s
	38m 45s

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