Added vercel.json with build env and headers.

.vercel/README.txt

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+> Why do I have a folder named ".vercel" in my project?
+The ".vercel" folder is created when you link a directory to a Vercel project.
+
+> What does the "project.json" file contain?
+The "project.json" file contains:
+- The ID of the Vercel project that you linked ("projectId")
+- The ID of the user or team your Vercel project is owned by ("orgId")
+
+> Should I commit the ".vercel" folder?
+No, you should not share the ".vercel" folder with anyone.
+Upon creation, it will be automatically added to your ".gitignore" file.

.vercel/project.json

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+{"projectId":"prj_GmHloLxsA85m9oh3j24XukHn1I0p","orgId":"AVKCWAV42DMOv7q1gyi0Mtvn"}

vercel.json

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+{
+	"build": {
+		"env": {
+			"HUGO_VERSION": "0.105.0"
+		}
+	},
+	"headers": [
+		{
+			"source": "/(.*)",
+			"headers": [
+				{
+					"key": "Strict-Transport-Security",
+					"value": "max-age=31536000; includeSubDomains; preload"
+				},
+				{
+					"key": "X-Frame-Options",
+					"value": "SAMEORIGIN"
+				},
+				{
+					"key": "Referrer-Policy",
+					"value": "strict-origin"
+				},
+				{
+					"key": "X-Content-Type-Options",
+					"value": "nosniff"
+				},
+				{
+					"key": "X-Powered-By",
+					"value": "Hugo"
+				}
+			]
+		}
+	]
+}