docs(platforms): change sentences in platforms whitepaper & add missing maturity-model contents in ko

[Eeap]

According to #641, I have translated it into Korean. Also I have changed wrong sentences(like missing img, words..) and added missing documents about maturity-model contents in kor platforms.

Thank you :)

[netlify]

✅ Deploy Preview for tag-app-delivery ready!

Name	Link
🔨 Latest commit	74b899a
🔍 Latest deploy log	https://app.netlify.com/sites/tag-app-delivery/deploys/663b52e2bc7cab00088b4113
😎 Deploy Preview	https://deploy-preview-646--tag-app-delivery.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[abangser]

Thanks for getting to this so quickly @Eeap!

As with any other translation, we will just look for another fluent speaker to review/approve before merging.

In addition, I noticed that you have copied the english version of a page into website/content/ko/wgs/platforms/maturity-model/v1/index.md. I believe at this point we have this being done automatically if the page is not yet translated for the language. Is there something you noted that required this?

[Eeap]

In addition, I noticed that you have copied the english version of a page into website/content/ko/wgs/platforms/maturity-model/v1/index.md. I believe at this point we have this being done automatically if the page is not yet translated for the language. Is there something you noted that required this?

Could I translate it with this PR until 8 May? Also, I know that another reviewer need for double checking..
I will find someone for checking as soon as possible :)

[Eeap]

@abangser I have translated it into Korean, and I will find someone who can check this again :)

Hi, @sysnet4admin 😊
Could you check this one(https://github.com/cncf/tag-app-delivery/pull/646/files#diff-489ac0dd08634c836ce31340a71348904cf452dd8d893c543e6a63af52219f8c) if you have time for reading ??

[sysnet4admin]

@Eeap Unfortunately, I have no time to contribute it anymore. you may consider with other member if you would like to review it.

[Eeap]

Okay, I got it. Thank you :)

[Eeap]

@abangser I have posted post for seeking people who would check it in linkedIn, but it takes some time for seeking 🥲.