Add Ghostty UltraViolet theme, adjust starship colors to match

.config/ghostty/README.md

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+# Ghostty config — macOS
+
+Ghostty sur macOS ne lit pas `~/.config/ghostty/`, mais :
+
+    ~/Library/Application Support/com.mitchellh.ghostty/
+
+Comme il n'y a pas (encore) de symlink automatisé, copier à la main :
+
+    cp .config/ghostty/themes/ultraviolet \
+       "~/Library/Application Support/com.mitchellh.ghostty/themes/ultraviolet"
+
+Puis dans `~/Library/Application Support/com.mitchellh.ghostty/config`, ajouter :
+
+    theme = ultraviolet

.config/ghostty/themes/ultraviolet

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+# UltraViolet theme for Ghostty
+# Source: https://github.com/Gurvirr/zed-ultraViolet
+
+background = 0B0C10
+foreground = DCD8ED
+
+cursor-color = 6F78FF
+cursor-text = 0B0C10
+selection-background = 222226
+selection-foreground = F2F4F8
+
+palette = 0=#282828
+palette = 1=#FF6FAE
+palette = 2=#08BD8A
+palette = 3=#E297DB
+palette = 4=#6F78FF
+palette = 5=#C58FFF
+palette = 6=#B3BCEF
+palette = 7=#DCD8ED
+palette = 8=#3A3A3A
+palette = 9=#FF9BC3
+palette = 10=#3DD4A6
+palette = 11=#F2B1ED
+palette = 12=#8B92FF
+palette = 13=#D3A8FF
+palette = 14=#CAD1FF
+palette = 15=#FFFFFF