feat: add renderer.highlight_hidden, renderer.icons.show.hidden and renderer.icons.hidden_placement for dotfile icons/highlights (#2840)

* feat(hidden_decorator): Allow hidden (dotfiles) to be highlighted, both icon and name (this not related to git highlights).

Better defaults

squashed

docs(hidden)

docs(hidden)

docs(hidden)

* fix(typo): small typo on hl groups

* feat(hidden_dotfile_highlight): make a file that has a dotfile parent be also a dotfile

* docs: update docs on hidden highlight

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Co-authored-by: Alexander Courtis <alex@courtis.org>

.gitignore

@@ -1,2 +1,4 @@
 /luals-out/
 /luals/
+# backup vim files
+*~