Add Calendar dashboard to Admin Panel about bookanook HOT 3 CLOSED

Monthly view would look something like:

If a day has more than 3 events, a "x more events" tab will appear instead of listing all of them. The admin can click on any day to open get a closer look at that day's reservation. This will help him/her to make confirmation decision. Here's an example:

Clicking on any of the events will redirect to its edit page. Alternatively, we can show a modal with 2 choices in the form of buttons: Confirm or reject. An admin will mostly make these updates.

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If there are no events, an admin can click at the time where a new reservation has to be made. A form for creating a reservation will open with date and time auto filled. The event period might be assumed of a certain length for auto-filling.

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Implemented in #116.

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