SWI-1756 Add Ruby Migration Guides (#962)

* SWI-1756 Add Ruby Migration Guides

* add v10 examples minus BXML

* trailing slashes

* add v11 examples minus BXML

* add links to intro page

* add BXML examples for v10

* add BXML examples for v11

Author: ckoegel

site/migration-guides/intro.mdx

@@ -17,3 +17,5 @@ image: '@site/static/img/bw-icon.svg'
 Home of migration guides between major versions of each SDK language
 
 * [Python](/migration-guides/python/)
+* [Java](/migration-guides/java/)
+* [Ruby](/migration-guides/ruby/)

site/migration-guides/ruby/intro.md

@@ -0,0 +1,19 @@
+---
+id: ruby-migration-guides
+title: Ruby
+slug: /ruby
+description: Ruby SDK Migration Guides
+sidebar_label: Overview
+image: '@site/static/img/bw-icon.svg'
+pagination_next: null
+pagination_prev: null
+---
+
+See our releases on [GitHub](https://github.com/Bandwidth/ruby-sdk/releases) for more detailed changelogs
+
+## [v11-beta](/migration-guides/ruby/v10->v11-beta/)
+
+### What's Changed
+
+* Generated an entirely new SDK using the open-source [OpenAPI Generator Library](https://openapi-generator.tech/)
+* Rewrote the [BXML library](/migration-guides/ruby/v10->v11-beta#bxml/)