Guide's Mobile version improvement

[yii-bot]

This issue has originally been reported by @slinstj at yiisoft/yii2#8773.
Moved here by @cebe.

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Principle: the guide's text should be the king:

Should have more space for the text;

Menu icon on the right up corner takes the entire line space, pushing the title down;

Should have a floating menu icon having the topics;

"Go to top" icon could be smaller and should not stand so over the text;

I don't think the "pencil" edit icon is useful since editions use to be made via PR. It's only one more thing to stands over the text;

At the end of the each topic it should be a next/before topic links;

[yii-bot]

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This is an automated comment, triggered by adding the label status:need more info.

[arogachev]

Not sure about this. Usually the docs are used simultaneously with writing code and majority of programmers use desktop / laptop setup with monitors or laptop screens as displays. It's hard to imagine someone's coding on a tablet / smartphone on a regular basis (except some extreme cases and experiments). Maybe you have a use case and can provide some details? @sdlins. This does not mean that we should not improve mobile version but it's not the high priority now I guess.

Another suggestion is to collect some stats using analytics services based on current user activity and rely on that for further decision.

@samdark What do you think?

[arogachev]

Also images / prototypes would be more visual (If you have time of course) @sdlins.

[samdark]

@arogachev good approach. We previously had analytics on the website but removed it (I don't remember the reason). Need to re-add it.

[samdark]

[arogachev]

Related - yiisoft-contrib/yiiframework.com#699.