feat(ui): update button variants following figma (#482)

* feat(ui): update button variants following figma

* feat(ui): separate size prop to allow for regular and small sized button variants

* update type to no longer include minimal-small

* update uno css config to use new spacing system

* add variants and sizes to file upload; update button and file upload stories

* add mini button variant and update small button

* specify width on icon-only regular variant

* update plus buttons to be mini sizes

* remove redundant classnames

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Co-authored-by: doprz <52579214+doprz@users.noreply.github.com>

src/views/components/common/MigrationDialog.tsx

@@ -53,7 +53,7 @@ function MigrationButtons({ close }: { close: () => void }): JSX.Element {
                 </Text>
             )}
             <Button
-                variant='single'
+                variant='minimal'
                 color='ut-black'
                 onClick={() => {
                     close();