Fix support for variable-size indentation (e.g. 2-space indentation)

[fchollet]

I'm currently using keras-autodoc with tf.keras (2-space indented), but argument/attribute sections did not render properly. This fixes it.

[gabrieldemarmiesse]

Cool thanks a lot! Maybe we could have a minimal test?

Edit: I just saw your other message. I'll add tests if I find the time. I'm currently quite busy with TensorFlow Addons 😄

[fchollet]

In the end, I've decided to internalize my usage of keras-autodocs in a lightweight fork included in the keras-io codebase (<350 lines). The motivation being that:

• we only use a subset of the functionality
• we don't use keras-autodocs through its intended API, instead, we use the render private method exclusively, plus a number of standalone utilities
• this exposes us to breakages when the code changes (e.g. this happened in the past 30 days)
• we need to do extensive customization, some of which can't be done via subclassing
• we need these customizations available now since keras-io is open-sourced at this time

So it was simpler to copy the part of the code we needed. Anyway, we can always refactor later.

[gabrieldemarmiesse]

Sure thing, that worked out pretty well, the website is great! :)