i18n(ja): update from-docusaurus.mdx

[Yusaku01]

I have several more fixes for src/content/docs/ja/guides/migrate-to-astro/*.mdx, so I'll open PRs for them sequentially.
I'm splitting them to make reviewing easier, as the changes aren't just in common areas.

Description (required)

This PR's change is based on the following a commit:

• bd2428a1e#diff-5880a5613fab83958c3738c4acada23e3c7e08da38e6408f8c977d2bec99ef6f

In addition, the following content has been adjusted to match the English version.

• change the expression MPA and SPA
• add links to framework components
• add the translation of the sentence "raw HTML template..." to the Japanese version.

Regarding MPA and SPA, the term application is used more frequently than app in the Astro Docs and other pages. Furthermore, I personally felt that in Japanese, the word app often carries a strong connotation of smartphone apps.

Related issues & labels (optional)

• Suggested label: i18n

I'd appreciate it if you could review this when you have time🫡

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[morinokami]

対応ありがとうございます！一点だけコメントしましたので、ご確認をお願いします 🙏

[morinokami]

ここなんですが、「必要に応じて〜対応しています」という部分が若干わかりづらいかなと思いました。原文は単純に「but can also support」なので、「必要に応じて」を抜くなどしていいかもしれませんね。

[Yusaku01]

@morinokami
レビューありがとうございます！！
確かに、「必要に応じて」部分はなくていいと思うので、除去しました！

[morinokami]

対応いただきありがとうございました。LGTM!