Deprecate marketing button tokens (#449)

Author: rezrah

.changeset/shy-islands-tap.md

@@ -0,0 +1,39 @@
+---
+'@primer/primitives': minor
+---
+
+Deprecated marketing design tokens for Button components
+
+Marketing tokens will be served from `@primer/brand-primitives` in future.
+
+```bash
+npm install --save @primer/brand-primitives
+```
+
+
+```diff
+- ---color-mktg-btn-bg
++ --brand-Button-background-base 
+```
+
+```diff
+- --color-mktg-btn-shadow-outline
++ --brand-Button-shadow-default
+```
+
+```diff
+- --color-mktg-btn-shadow-focus
++ --brand-Button-shadow-focus
+```
+
+```diff
+- --color-mktg-btn-shadow-hover
++ --brand-Button-shadow-primary-hover
+```
+
+```diff
+- --color-mktg-btn-shadow-muted
++ --color-mktg-btn-shadow-hover-muted
+```
+
+:link: [See the `0.9.0` for all other tokens.](https://unpkg.com/browse/@primer/brand-primitives@0.9.0/lib/design-tokens/css/tokens/functional/components/button/colors-with-modes.css)

data/colors/deprecated.json

@@ -1 +1,7 @@
-{}
+{
+  "mktg.btn.bg": null,
+  "mktg.btn.shadow.outline": null,
+  "mktg.btn.shadow.focus": null,
+  "mktg.btn.shadow.hover": null,
+  "mktg.btn.shadow.hoverMuted": null
+}