Replace alphabetical sorting by un-sorting

Alphabetical ordering of links doesn't really look useful and should be removed. In its turn, having "unordered" list mode could be useful because it would not spend time on sorting links when user doesn't care about order, e.g. when they [use search](https://github.com/ARK-Builders/ARK-Shelf-Desktop/issues/19) or [filtering by tags](https://github.com/ARK-Builders/ARK-Shelf-Desktop/issues/2).

Start by locating where links are alphabetically sorted, then review the linked search issue (#19) and tag-filtering issue (#2) for context. Done means alphabetical sorting can be skipped through an unordered list mode, so users who do not care about order avoid sorting.

Written by the indexing model from the issue text.