Add explicit support for 'mini.nvim'

Hi! I would like to add explicit support for mini.nvim.

Basic choices are taken from highlight groups to which 'mini.nvim' makes links by default or from analogous plugins.

Differences from default linked groups:

'mini.cursorword' is based on 'Illuminate'.
'mini.indentscope' is based on 'Indent Blankline'.
'mini.jump' is based on 'Sneak'.
'mini.jump2d' is chosen to be visually distinctive. Using nocombine to be consistent (not have italic labels on italic text).
'mini.starter' is based on 'Dashboard' and personal choices:
- MiniStarterItemBullet is as border.
- MiniStarterItemPrefix and MiniStarterQuery are based on "warning" and "info" diagnostic colors to be opposite of each other.
- MiniStarterSection is chosen to be visible (as from "Special" highlight group).
'mini.statusline' is based on 'lualine/themes/nord.lua' and personal choices:
- MiniStatuslineDevinfo and MiniStatuslineFileinfo are "slightly different text".
- All MiniStatuslineMode* have bold text to be visually distinctive.
- MiniStatuslineModeOther is chosen to be different from others.
'mini.tabline' is based on 'Barbar':
- MiniTablineTabpagesection is as "Search" but with bold text for visibility.
'mini.test' has red for fail and green for pass.
'mini.trailspace' has group with red background to draw attention.

Before:

After:

shaunsingh / nord.nvim