Update configurations

alacritty/themes/high_contrast.toml

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+# Colors (High Contrast)
+
+# Default colors
+[colors.primary]
+background = '#444444'
+foreground = '#dddddd'
+
+# Colors the cursor will use if `custom_cursor_colors` is true
+[colors.cursor]
+text = '#aaaaaa'
+cursor = '#ffffff'
+
+# Normal colors
+[colors.normal]
+black   = '#000000'
+red     = '#ff0000'
+green   = '#00ff00'
+yellow  = '#ffff00'
+blue    = '#0000ff'
+magenta = '#ff00ff'
+cyan    = '#00ffff'
+white   = '#ffffff'
+
+# Bright colors
+[colors.bright]
+black   = '#000000'
+red     = '#ff0000'
+green   = '#00ff00'
+yellow  = '#ffff00'
+blue    = '#0000ff'
+magenta = '#ff00ff'
+cyan    = '#00ffff'
+white   = '#ffffff'