Add OneDark color theme.

This theme is inspired on the OneDark color scheme, some opioniated
choices were made for using solid blacks for readability as opposed to
using the OneDarks black.

For a seamless alacritty theme, see an example of the same theme applied
over here: https://github.com/lucasteligioridis/dot-files/blob/master/dot/alacritty.yml

skins/one_dark.yml

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+# OneDark presets
+foreground: &foreground "#abb2bf"
+background: &background "#282c34"
+black: &black "#080808"
+blue: &blue "#61afef"
+green: &green "#98c379"
+grey: &grey "#abb2bf"
+orange: &orange "#ffb86c"
+purple: &purple "#c678dd"
+red: &red "#e06370"
+yellow: &yellow "#e5c07b"
+yellow_bright: &yellow_bright "#d19a66"
+
+k9s:
+  body:
+    fgColor: *foreground
+    bgColor: *background
+    logoColor: *green
+  info:
+    fgColor: *grey
+    sectionColor: *green
+  dialog:
+    fgColor: *black
+    bgColor: *background
+    buttonFgColor: *foreground
+    buttonBgColor: *green
+    buttonFocusFgColor: *black
+    buttonFocusBgColor: *blue
+    labelFgColor: *orange
+    fieldFgColor: *blue
+  frame:
+    border:
+      fgColor: *green
+      focusColor: *green
+    menu:
+      fgColor: *grey
+      keyColor: *yellow
+      numKeyColor: *yellow
+    crumbs:
+      fgColor: *black
+      bgColor: *green
+      activeColor: *yellow
+    status:
+      newColor: *blue
+      modifyColor: *green
+      addColor: *grey
+      pendingColor: *orange
+      errorColor: *red
+      highlightcolor: *yellow
+      killColor: *purple
+      completedColor: *grey
+    title:
+      fgColor: *blue
+      bgColor: *background
+      highlightColor: *purple
+      counterColor: *foreground
+      filterColor: *blue
+  views:
+    charts:
+      bgColor: *background
+      defaultDialColors:
+        - *green
+        - *red
+      defaultChartColors:
+        - *green
+        - *red
+    table:
+      fgColor: *yellow
+      bgColor: *background
+      cursorFgColor: *black
+      cursorBgColor: *blue
+      markColor: *yellow_bright
+      header:
+        fgColor: *grey
+        bgColor: *background
+        sorterColor: *orange
+    xray:
+      fgColor: *blue
+      bgColor: *background
+      cursorColor: *foreground
+      graphicColor: *yellow_bright
+      showIcons: false
+    yaml:
+      keyColor: *red
+      colonColor: *grey
+      valueColor: *grey
+    logs:
+      fgColor: *grey
+      bgColor: *background
+      indicator:
+        fgColor: *blue
+        bgColor: *background
+    help:
+      fgColor: *grey
+      bgColor: *background
+      indicator:
+        fgColor: *blue