docs(migration): add initial 11.x docs for sass modules

docs/migration/11.x-layout.md

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+# Layout
+
+**Note: everything in this file is a work-in-progress and will be changed.**
+
+## Changes
+
+| v10                               | v11                       |
+| --------------------------------- | ------------------------- |
+| `$carbon--base-font-size`         | `$base-font-size`         |
+| `carbon--rem`                     | `rem`                     |
+| `carbon--em`                      | `em`                      |
+| `$carbon--grid-gutter`            | `$grid-gutter`            |
+| `$carbon--grid-gutter--condensed` | `$grid-gutter--condensed` |
+| `$carbon--grid-breakpoints`       | `$grid-breakpoints`       |
+| `carbon--breakpoint-next`         | `breakpoint-next`         |
+| `carbon--breakpoint-prev`         | `breakpoint-prev`         |
+| `carbon--is-smallest-breakpoint`  | `is-smallest-breakpoint`  |
+| `carbon--largest-breakpoint-name` | `largest-breakpoint-name` |
+| `carbon--breakpoint-infix`        | `breakpoint-infix`        |
+| `carbon--breakpoint-up`           | `breakpoint-up`           |
+| `carbon--breakpoint-down`         | `breakpoint-down`         |
+| `carbon--breakpoint-between`      | `breakpoint-between`      |
+| `carbon--largest-breakpoint`      | `largest-breakpoint`      |
+| `carbon--breakpoint`              | `breakpoint`              |

docs/migration/11.x-motion.md

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+# Motion
+
+**Note: everything in this file is a work-in-progress and will be changed.**
+
+## Changes
+
+| v10                        | v11        |
+| -------------------------- | ---------- |
+| `$carbon--easings`         | `$easings` |
+| `@function carbon--motion` | `motion`   |
+| `@mixin carbon--motion`    | `motion`   |