feat: Update Drizzle document

[mhenke]

Is your feature request related to a problem? Please describe.

• Update the Drizzle documentation page
• Add Drizzle to why.md
• Add Drizzle to introduction.md

Describe the solution you'd like to see

Create the Drizzle document based on the current Prisma document.

Describe alternate solutions

N/A

Additional information

I'll give contributing a try to the documents. I'm new so please help me out if I am doing something wrong. I read the contributions guideline and contributing guideline to docs.

[ThomasBouasli]

Hey @mhenke, I saw that you said you were new to OSS, I implemented only a part of your issue in this PR #1659, do you want to add the rest? Just for the experience, this is also my first OSS contribution.