where is the central documentation of arm-none-eabi in html view?

I'm wondering which html file I have to open with my browser in the local file system to view the full documentation of all arm-none-eabi.

When I get into

file:///~/opt/gcc-arm-none-eabi-8-2018-q4-major/share/doc/gcc-arm-none-eabi/html/

I see a lot of directories, named .html, but where is the central HTML-file I can open to browse through all documentation?

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