Documenting the package tag on uikits config entries (#1249)

Author: ringods

packages/docs/src/docs/advanced-config-options.md

@@ -307,17 +307,20 @@ Introduced in Pattern Lab Node v3, UIKits are a new term in the Pattern Lab [Eco
 `uikits` accepts an array of UIKit objects, shipping with the one above.
 
 - `name`: the name of the UIKit
+- `package`: the NodeJS package name. This property was introduced in version 5.13 to allow for a uikit package to be used multiple times with different names. Add the package as a dependency in `package.json` before you configure it here.
 - `outputDir` where to output this UIKit relative to the current root. By leaving this empty we retain the existing Pattern Lab 2.X behavior, outputting to `<project_root>/public`. If you had multiple UIKits, however, you would provide different values, such as:
 
 ```javascript
   "uikits": [
     {
       "name": "uikit-workshop",
+      "package": "@pattern-lab/uikit-workshop",
       "outputDir": "workshop",
       ...
     },
     {
       "name": "uikit-storefront",
+      "package": "@pattern-lab/uikit-storefront",
       "outputDir": "storefront",
       ...
     }
@@ -333,13 +336,19 @@ Important details:
 - the [default `paths.source` object paths](https://github.com/pattern-lab/patternlab-node/pull/840/commits/a4961bd5d696a05fb516cdd951163b0f918d5e19) within `patternlab-config.json` are now relative to the current UIKit. See the [structure of uikit-workshop](https://github.com/pattern-lab/patternlab-node/tree/master/packages/uikit-workshop) for more info
 - the [default `paths.public` object paths](https://github.com/pattern-lab/patternlab-node/pull/840/commits/812bab3659f504043e8b61b1dc1cdac71f248449) within `patternlab-config.json` are now relative to the current UIKit's `outputDir`. Absolute paths will no longer work. Someone could test putting an absolute path in a UIKit `outputDir` property and see what happens I suppose.
 - `dependencyGraph.json` has moved to the project root rather than `public/` as we should only retain one
+- The lookup of the uikit by `name` is deprecated and the user will be notified of it. If the `package` property isn't defined, there is a default fallback lookup strategy where the value of `name` is tried as:
+  - `<name>`
+  - `uikit-<name>`
+  - `@pattern-lab/<name>`
+  - `@pattern-lab/uikit-<name>`
 
 **default**:
 
 ```javascript
   "uikits": [
     {
       "name": "uikit-workshop",
+      "package": "@pattern-lab/uikit-workshop",
       "outputDir": "",
       "enabled": true,
       "excludedPatternStates": [],