docs: consolidate and optimize .github documentation #34

Job	Run time
macOS \| NDK-r26d \| cmake \| with-ffmpeg \| 16kb	3m 3s
macOS \| NDK-r27c \| ndk-build \| with-ffmpeg \| 16kb	2m 10s
macOS \| NDK-r27c \| ndk-build \| with-ffmpeg \| 4kb	1m 54s
macOS \| NDK-r26d \| cmake \| no-ffmpeg \| 16kb	2m 51s
macOS \| NDK-r27c \| cmake \| with-ffmpeg \| 4kb	3m 3s
macOS \| NDK-r27c \| ndk-build \| no-ffmpeg \| 16kb	2m 55s
macOS \| NDK-r26d \| ndk-build \| with-ffmpeg \| 16kb	2m 54s
macOS \| NDK-r26d \| cmake \| with-ffmpeg \| 4kb	4m 22s
macOS \| NDK-r27c \| cmake \| with-ffmpeg \| 16kb	5m 26s
macOS \| NDK-r26d \| ndk-build \| with-ffmpeg \| 4kb	3m 27s
macOS \| NDK-r27c \| cmake \| no-ffmpeg \| 4kb	3m 0s
macOS \| NDK-r27c \| cmake \| no-ffmpeg \| 16kb	3m 40s
macOS \| NDK-r26d \| cmake \| no-ffmpeg \| 4kb	4m 38s
macOS \| NDK-r26d \| ndk-build \| no-ffmpeg \| 4kb	2m 11s
macOS \| NDK-r27c \| ndk-build \| no-ffmpeg \| 4kb	1m 54s
macOS \| NDK-r26d \| ndk-build \| no-ffmpeg \| 16kb	1m 49s
	49m 17s

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