chore: deprecation icon docs (#427)

docs/Foundations/Icons.mdx

@@ -36,3 +36,18 @@ To process the uploaded SVGs with the `SVGPrettifier`, a server must be running
    ```bash
    npm run icons-prettifier
    ```
+
+### FAQ:
+
+Q: What if an icon in Figma has a FontAwesome name or doesn't follow the standard naming format? Should I name it myself?
+A: Please contact the design team. They'll provide the correct name and make sure the icon is properly reflected in the design library.
+
+Q: When do we use mParticle custom icons instead of default Ant Design (AntD) icons?
+A: In our design system, Ant Design (AntD) icons are the primary choice across components. However, custom mParticle icons are used in the following scenarios:
+
+Q: When do we use mParticle custom icons instead of default Ant Design (AntD) icons?
+A: In our design system, Ant Design (AntD) icons are the primary choice across components. However, custom mParticle icons are used in the following scenarios:
+
+- When the design team explicitly requests a customized icon.
+- When the AntD library does not offer a suitable icon for a specific use case.
+- When an existing AntD icon does not align with mParticle’s design or functional requirements.

src/components/navigation/Dropdown/Dropdown.tsx

@@ -3,7 +3,11 @@ import { type DropdownProps as AntDropdownProps } from 'antd'
 import { ConfigProvider } from 'src/components'
 
 export interface IDropdownProps extends AntDropdownProps {}
-
+/**
+ * @deprecated This component is deprecated and will be removed in future versions.
+ * Please use the Select component instead. You can find more details here:
+ * https://mparticle.github.io/aquarium/?path=/docs/components-data-entry-select--documentation
+ */
 export const Dropdown = (props: IDropdownProps) => {
   return (
     <ConfigProvider>