feat(theme): add DocCard component with Markdown

[sserrata]

Summary

• create DocCard theme override
• render description with Markdown

Addresses #1159

Testing

• yarn lint
• yarn test

---

https://chatgpt.com/codex/tasks/task_e_6865458e757483238f3968499b204df5

[github-actions]

Visit the preview URL for this PR (updated for commit e665a3d):

https://docusaurus-openapi-36b86--pr1194-fro0wv29.web.app

_{(expires Sat, 02 Aug 2025 20:48:56 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: bf293780ee827f578864d92193b8c2866acd459f}

[github-actions]

Visual Diff Summary

View Logs

Total: 77, Matches: 73, Diffs: 4, Skipped: 0

Page	Status
/tests/additionalproperties-variations-api	diff
/tests/allof-variations-api	diff
/tests/discriminator-variations-api	diff
/tests/enum-descriptions-test	diff

[github-actions]

Visual Diff Summary

View Logs

Total: 77, Matches: 73, Diffs: 4, Skipped: 0

Page	Status
/tests/additionalproperties-variations-api	diff
/tests/allof-variations-api	diff
/tests/discriminator-variations-api	diff
/tests/enum-descriptions-test	diff

[github-actions]

Visual Diff Summary

View Logs

Total: 77, Matches: 72, Diffs: 5, Skipped: 0

Page	Status
/tests/additionalproperties-variations-api	diff
/tests/allof-variations-api	diff
/tests/discriminator-variations-api	diff
/tests/discriminator-with-subschema-inheriting-all-fields-no-extra-fields	diff
/tests/enum-descriptions-test	diff

[github-actions]

Visual Diff Summary

View Logs

Total: 77, Matches: 68, Diffs: 9, Skipped: 0

Page	Status
/tests/additionalproperties-variations-api	diff
/tests/allof-variations-api	diff
/tests/anyof-variations-api	diff
/tests/const	diff
/tests/discriminator-variations-api	diff
/tests/discriminator-with-subschema-inheriting-all-fields-no-extra-fields	diff
/tests/enum-descriptions-test	diff
/tests/oneof-variations-api	diff
/tests/parameter-serialization-demo-api	diff

[github-actions]

Visual Diff Summary

View Logs

Total: 77, Matches: 68, Diffs: 9, Skipped: 0

Page	Status
/tests/additionalproperties-variations-api	diff
/tests/allof-variations-api	diff
/tests/anyof-variations-api	diff
/tests/const	diff
/tests/discriminator-variations-api	diff
/tests/discriminator-with-subschema-inheriting-all-fields-no-extra-fields	diff
/tests/enum-descriptions-test	diff
/tests/oneof-variations-api	diff
/tests/parameter-serialization-demo-api	diff

[github-actions]

Visual Diff Summary

View Logs

Total: 77, Matches: 68, Diffs: 9, Skipped: 0

Page	Status
/tests/additionalproperties-variations-api	diff
/tests/allof-variations-api	diff
/tests/anyof-variations-api	diff
/tests/const	diff
/tests/discriminator-variations-api	diff
/tests/discriminator-with-subschema-inheriting-all-fields-no-extra-fields	diff
/tests/enum-descriptions-test	diff
/tests/oneof-variations-api	diff
/tests/parameter-serialization-demo-api	diff

[github-actions]

Visual Diff Summary

View Logs

Total: 77, Matches: 68, Diffs: 9, Skipped: 0

Page	Status
/tests/additionalproperties-variations-api	diff
/tests/allof-variations-api	diff
/tests/anyof-variations-api	diff
/tests/const	diff
/tests/discriminator-variations-api	diff
/tests/discriminator-with-subschema-inheriting-all-fields-no-extra-fields	diff
/tests/enum-descriptions-test	diff
/tests/oneof-variations-api	diff
/tests/parameter-serialization-demo-api	diff