Revert "Move wiki pages to github pages (#18497)"

This reverts commit 40eb803de1.

docs/_doc/Provisional-JS-API.md

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-title: Provisional JS API
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-The *provisional* JavaScript API is a purposed API for all things JavaScript. JavaScript technologies can be embedded within Qt(QML) technologies, local web and remote web and therefor the purposed API is written in a ASYNC fashion so that it may be used across all implementations. Hereby it should be known that all functions, unless explicitly specified, take a callback as last function argument which will be called when the operation has been completed.
-
-Please note that the provisional JavaScript API tries to leverage existing JS idioms as much as possible.
-
-## General API
-
-* `getBlock (number or string)`
-    Retrieves a block by either the address or the number. If supplied with a string it will assume address, number otherwise.
-* `transact (sec, recipient, value, gas, gas price, data)`
-    Creates a new transaction using your current key.
-* `create (sec, value, gas, gas price, init, body)`
-    Creates a new contract using your current key.
-* `getKey (none)`
-    Retrieves your current key in hex format.
-* `getStorage (object address, storage address)`
-    Retrieves the storage address of the given object.
-* `getBalance (object address)`
-    Retrieves the balance at the current address
-* `watch (string [, string])`
-    Watches for changes on a specific address' state object such as state root changes or value changes.
-* `disconnect (string [, string])`
-    Disconnects from a previous `watched` address.
-
-## Events
-
-The provisional JavaScript API exposes certain events through a basic eventing mechanism inspired by jQuery.
-
-* `on (event)`
-    Subscribe to event which will be called whenever an event of type <event> is received.
-* `off (event)`
-    Unsubscribe to the given event
-* `trigger (event, data)`
-    Trigger event of type <event> with the given data. **note:** This function does not take a callback function.
-    
-### Event Types
-
-All events are written in camel cased style beginning with a lowercase letter. Subevents are denoted by a colon `:`.
-
-* `block:new`
-    Fired when a new valid block has been found on the wire. The attached value of this call is a block.
-* `object:changed`
-    Fired when a watched address, specified through `watch`, changes in value.