Add dynamic og:image generation

[adityaoberai]

Uses @vercel/og to add dynamic og:image generation to the template

Ships with a default OG image config too

[adityaoberai]

• Site with default OG image: https://imagine-6973e87400305296d5ff.appwrite.network/

• Site with custom OG image: https://imagine-6973f15a0030e3ca147b.appwrite.network/

[adityaoberai]

[adityaoberai]

Current state of OG previews

• Default OG (with screenshot): https://imagine-697ccbb80026482613e5.appwrite.network/

• Custom OG (configurable, can be entirely overhauled on user request): https://imagine-697cce3e00365c471fcf.appwrite.network/