Feature/use known option

[winter-yuki]

Closes #203

[zuevval]

I suppose it should be implemented like this 👇

[zuevval]

There are three changes in this request:

1. docs
2. help margins
3. practice options changed

The last I do not support for reasons described above (also: I plan to probably add more decks, e. g. english, spanish, french, deutsh, math, musical, chemical...; I plan to probably add a writing mode, where letters are mirrored, add an option to switch on/off higher probability of occurence of letters that user typed in incorrectly; this all seems to be more logical to control within a single screen, which is accessible in one click and icon is BIG and MEANINGFUL (who knows what's behind "other options"?)).

Let's raise a discussion? @braille-systems/learn-braille-team

[zuevval]

This seems to be right, thank you. At least popular readers on Android feature margins. Compare:

[winter-yuki]

There are three changes in this request:

1. docs

2. help margins

3. practice options changed

The last I do not support for reasons described above (also: I plan to probably add more decks, e. g. english, spanish, french, deutsh, math, musical, chemical...; I plan to probably add a writing mode, where letters are mirrored, add an option to switch on/off higher probability of occurence of letters that user typed in incorrectly; this all seems to be more logical to control within a single screen, which is accessible in one click and icon is BIG and MEANINGFUL (who knows what's behind "other options"?)).

Let's raise a discussion? @braille-systems/learn-braille-team

This PR solves a particular problem. Not going to redesign something general here.

[zuevval]

This PR solves a particular problem. Not going to redesign something general here.

It solves a problem in a strange fashion.
And, besides, brings a new problem: "change deck" menu is not accessible directly from practice

[zuevval]

there are basically two types of features:

1. Proof-of-concept. These needn't bee super-convenient, polished and reliable
2. Usability improvement. Here we should do our best.
   This one is of the second type. So I'm going to try an alternative design myself.

[zuevval]

here is my vision (though not fully functional, but design is ~ as I would like to see)

[kaustika]

I prefer the way @winter-yuki implemented it tbh. Its easily accessed from where its needed the most - right from the practice with one click.
But maybe(?) it would be useful to have the same switch in general settings, thinking of it as a place where all the preferences can be set.

[zuevval]

@kaustika thank you. But in my version these settings are accessible in one click, too. This menu pops up on “change decks” button click

[zuevval]

I trust in good judgement and common sense of @kaustika and @winter-yuki so let's for now it be like this.

@winter-yuki what do you think about keeping the switch in general settings? I suppose it's a good idea, maybe you could do it?

[zuevval]

@winter-yuki please, return the switch (or decide not to return) and let me know when you're done, I will change the help message accordingly and merge this request.

[zuevval]

I will delete the corresponding branch.

But will save this code in my clone of this repo: https://github.com/zuevval/learn-braille/tree/feature/use-known-option

Just in case.