calendarBox: Create a calendar box for the main body of a dashboard.
In gyang274/ygdashboard: Create Dashboards with 'Shiny' and 'adminLTE'.

A calendar box displays calendar as main box content, an optional list of calendar menu, and optional smaller subtitles on the box footer often as task tracker. Calendar boxes are meant to be placed in the main body of a dashboard.

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calendarBox(title, calendarMenu = NULL, icon = shiny::icon("calendar"),
  color = "aqua", width = 6, href = NULL, fill = FALSE, tasks = NULL,
  tasksProg = NULL)

`title`	Title text.
`icon`	An icon tag, created by `icon`.
`color`	A color for the box. Valid colors are listed in validColors.
`width`	The width of the box, using the Bootstrap grid system. This is used for row-based layouts. The overall width of a region is 12, so the default valueBox width of 4 occupies 1/3 of that width. For column-based layouts, use `NULL` for the width; the width is set by the column that contains the box.
`href`	An optional URL to link to.
`fill`	If `FALSE` (the default), use a white background for the content, and the `color` argument for the background of the icon. If `TRUE`, use the `color` argument for the background of the content; the icon will use the same color with a slightly darkened background.
`value`	The value to display in the box. Usually a number or short text.
`subtitle`	Subtitle text (optional).