ian/#38/view accepted submissions

[otsembo]

The following changes have been made:

1. Add an endpoint for viewing all accepted submissions to the library.
2. Add an endpoint for searching for a submission based on the title or description.

[github-actions]

Visit the preview URL for this PR (updated for commit e592000):

https://moringa-library--pr68-ian-38-view-accepte-q1oov8rf.web.app

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