`GET /api/texts/` route should return only what the texts page needs.

[mrchrmn]

At this moment, all information about a text, including the full text, is transferred from the server for the text list page.

This may not be problematic now, but it could become a problem when the list grows and the texts become longer (think book chapters), particularly on mobile.

I suggest that for the list the query returns only the id, title, and truncated text. When clicked, the full information, including full text, is loaded and stored in the currenttextState.