[GH 9, 10, 11], add filter events

[tohuynh]

Pull request recommendations:

• [x] Link to any relevant issue in the PR description. Ex: Resolves [gh-6], adds CI for the project Resolves #9, #10, #11
• [x] Provide context of changes. Add filtering popups to /events and /search The user can filter events by committee names and date range (from and to). For /events, the user can sort events by Committee and Date. For /search, in addition to Committee and Date, the user can also sort by Relevance.
• [x] Provide relevant tests for your feature or bug fix (if applicable).
• [x] Provide or update documentation for any feature added by your pull request (if applicable).
• [x] Provide a link to a staging deployment or screenshots of changes (if applicable).

Thanks for contributing!