アコーディオンのタイトルの色を変更

[shungenie]

やったこと

アコーディオンのタイトル部分を１段濃くした

関連イシュー

1623

変更したコンポーネント

https://deploy-preview-1625--ingred-ui.netlify.app/?path=/docs/components-navigation-accordion--docs

Check List (If️ you added new component in this PR)

• [x] Export the component in src/components/index.ts
• [x] Add example to .storybook/documents/Information/Samples/Samples.stories.tsx
• [x] Localize added component

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: e6dd780f16c6f0636ae8dbc3a15bb5ad58541f70

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | --------- | ----- | | ingred-ui | Minor |

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[netlify[bot]]

✅ Deploy Preview for ingred-ui ready!

Name	Link
🔨 Latest commit	e6dd780f16c6f0636ae8dbc3a15bb5ad58541f70
🔍 Latest deploy log	https://app.netlify.com/sites/ingred-ui/deploys/6656c1cb69e9c70008d9ff77
😎 Deploy Preview	https://deploy-preview-1625--ingred-ui.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.

[noronaoki]

@shungenie LGTM!!