Lettre: add style variations (#7074)

lettre/styles/black.json

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+{
+	"$schema": "https://schemas.wp.org/trunk/theme.json",
+	"version": 2,
+	"title": "Black",
+	"settings": {
+		"color": {
+			"palette": [
+				{
+					"slug": "primary",
+					"color": "#000000",
+					"name": "Primary"
+				},
+				{
+					"slug": "secondary",
+					"color": "#FFFFFF",
+					"name": "Secondary"
+				},
+				{
+					"slug": "tertiary",
+					"color": "#D9D9D9",
+					"name": "Tertiary"
+				},
+				{
+					"slug": "foreground",
+					"color": "#1E1E1E",
+					"name": "Foreground"
+				}
+			]
+		}
+	}
+}

lettre/styles/vivid-purple.json

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+{
+	"$schema": "https://schemas.wp.org/trunk/theme.json",
+	"version": 2,
+	"title": "Vivid purple",
+	"settings": {
+		"color": {
+			"palette": [
+				{
+					"slug": "primary",
+					"color": "#9B51E0",
+					"name": "Primary"
+				},
+				{
+					"slug": "secondary",
+					"color": "#FFFFFF",
+					"name": "Secondary"
+				},
+				{
+					"slug": "tertiary",
+					"color": "#D9D9D9",
+					"name": "Tertiary"
+				},
+				{
+					"slug": "foreground",
+					"color": "#1E1E1E",
+					"name": "Foreground"
+				}
+			]
+		}
+	}
+}

lettre/styles/vivid-red.json

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+{
+	"$schema": "https://schemas.wp.org/trunk/theme.json",
+	"version": 2,
+	"title": "Vivid red",
+	"settings": {
+		"color": {
+			"palette": [
+				{
+					"slug": "primary",
+					"color": "#CF2E2E",
+					"name": "Primary"
+				},
+				{
+					"slug": "secondary",
+					"color": "#FFFFFF",
+					"name": "Secondary"
+				},
+				{
+					"slug": "tertiary",
+					"color": "#D9D9D9",
+					"name": "Tertiary"
+				},
+				{
+					"slug": "foreground",
+					"color": "#1E1E1E",
+					"name": "Foreground"
+				}
+			]
+		}
+	}
+}