Added axis type to Recharts.lean, modified Plot.lean to illustrate. (#99)

* Added axis type to Recharts.lean, modified Plot.lean to illustrate.

* Committing package-lock.json cache files

See
https://leanprover.zulipchat.com/#narrow/channel/113489-new-members/topic/lake.20update's.20.20widget.2Fpackage-lock.2Ejson.2E*.20in.20ProofWidgets4.3F/near/490592688

* Modified the release URL

* Apply suggestions from code review

* chore: revert some changes

---------

Co-authored-by: Marshall Abrams <marshall@logical.net>
Co-authored-by: Wojciech Nawrocki <wjnawrocki+gh@protonmail.com>

Author: 3 people

ProofWidgets/Component/Recharts.lean

@@ -38,10 +38,20 @@ def LineChart : Component LineChartProps where
   javascript := Recharts.javascript
   «export» := "LineChart"
 
+inductive AxisType where
+  /-- Treat values as numbers: spacing on axis by numeric difference. -/
+  | number
+  /-- Treat values as categorical: equal spacing between values. -/
+  | category
+  deriving FromJson, ToJson
+
 structure AxisProps where
   dataKey? : Option Json := none
   domain? : Option (Array Json) := none
   allowDataOverflow : Bool := false
+  /-- How values along this axis should be interpreted.
+  The Recharts default is `category`. -/
+  type : AxisType := .number
   -- TODO: There are many more props
   deriving FromJson, ToJson