1. It vertically centers top script menu (including selectors for view,
OS and recommendation levels). Before, it did not utilize the empty
space on smaller screens when of the menu items overflowed to a new
line. This commit fixes it, also adds margin on top selectors on
small screens.
2. It adds vertical margin between slider items on vertical view. It
also refactors slider component so that the `v-deep` is no longer
used, instead style is set through properties.
3. It ensures symmetrical margin on both sides of the handle in slider
during horizontal view. Before, the left margin did not exist and
right margin was too wide. This commit balances right and left margin
of the arrow.
4. It changes the way margining is done for the card list. It removes
internal margin from cards, because when they have them they also add
that to the outer card list. This commit solves it in a way that
unifies setting gap between cards and setting gap between cards.
The styles are controlled on card list instead. This way same margins
and paddings is also applied to non-card view (i.e. scripts tree).
Before margining was done separately and those views looked
diferently.
5. It improves styling of cards. It uses variables instead of hardcoded
values and also refactors and renames variables for simpler
understanding.
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