Update Astro and Tina

package.json

@@ -10,14 +10,14 @@
 		"astro": "astro"
 	},
 	"devDependencies": {
-		"@astrojs/rss": "^4.0.1",
-		"@astrojs/sitemap": "^3.0.5",
-		"astro": "^4.1.1",
-		"prettier": "^3.1.0",
-		"prettier-plugin-astro": "^0.12.2"
+		"@astrojs/rss": "^4.0.7",
+		"@astrojs/sitemap": "^3.1.6",
+		"astro": "^4.15.2",
+		"prettier": "^3.3.3",
+		"prettier-plugin-astro": "^0.14.1"
 	},
 	"dependencies": {
-		"@tinacms/cli": "^1.5.43",
-		"tinacms": "^1.6.1"
+		"@tinacms/cli": "^1.6.2",
+		"tinacms": "^2.2.0"
 	}
 }

src/posts/markdown-example.md

@@ -52,8 +52,6 @@ V franzen umami hammock scenester retro VHS, pop-up truffaut tacos polaroid heir
 
 **bold** _italic_
 **_bold and italic_**
-~~strikethrough~~
-==highlighted text==
 
 ```js
 // This is an example of some React