feat: Added DLS v7 to v8 migration guide

docs/MIGRATION_7_TO_8.md

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+# Migrating from DLS7 to DLS8
+
+## Breaking Changes
+
+**None!** Technically, there are no breaking changes in this release. However,
+out of an abundance of caution, we are shipping DLS8 as a new major release
+since it contains lots of new components (and therefore, new dependencies)!
+
+DLS8 should not increase your bundle size until you import / use the new
+components. But if your bundle analyzer is telling you otherwise, please reach
+out!
+
+## New Features
+
+* Added a new `ENCOURA` theme, which represents Encoura's primary look and feel
+* Added new chart molecules, which are built using
+[Recharts](https://recharts.org/):
+  * `AreaChart`
+  * `BarChart`
+  * `LineChart`
+  * `PieChart`
+  * `OverlappedBarChart`
+  * `ScatterPlot`
+  * `StackedBarChart`
+* Added a new `DEFAULT_CHART_COLORS` constant, which contains fallback chart
+colors that are used when a chart component is not provided with sufficient
+color information (either through the theme or through props)
+* Added new map molecules, which are built using
+[Mapbox GL](https://docs.mapbox.com/mapbox-gl-js/guides):
+  * `Map`
+  * `CountyMap`
+  * `GeomarketMap`
+  * `HeatMap`
+  * `SCFMap`
+  * `StateMap`
+* Bumped all dependencies to their latest releases, including MUI to `v5.15.14`
+* Bumped the DLS's Node version to `v20`
+
+## Customizing Charts & Maps
+
+If you add a chart or map to your project and find that the default color scheme
+is grey, this means that the colors have not been customized (yet)
+on your theme.
+
+In order to customize these colors, e.g. for the `BarChart` component, you can
+augment your `theme.components` section as follows:
+
+```json
+{
+  ...
+  components: {
+    ...
+    DlsBarChart: {
+      defaultProps: {
+        colors: ['red', 'green', '#FF00FF', 'orange', '#00FF00'],
+      },
+    },
+    ...
+  },
+  ...
+}
+```
+
+Now, any time `BarChart` is used within your theme, it will have the above
+color scheme pre-configured by default.
+
+Like any other Material UI component, you can override the theme defaults in
+order to handle one-off scenarios:
+
+```tsx
+<BarChart
+  ...
+  colors={['black', 'orange', 'pink']}
+  ...
+/>
+```

src/_docs/4.MIGRATION_6_TO_7.mdx

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+{/* @prettier */}
+
+import { Meta } from '@storybook/addon-docs';
+import { Markdown } from '@storybook/blocks';
+
+import MIGRATION_6_TO_7 from '~/../docs/MIGRATION_6_TO_7.md?raw';
+
+<Meta title="DLS/Migration Guide (v.7)" />
+
+<Markdown>{MIGRATION_6_TO_7}</Markdown>

src/_docs/5.MIGRATION_7_TO_8.mdx

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+{/* @prettier */}
+
+import { Meta } from '@storybook/addon-docs';
+import { Markdown } from '@storybook/blocks';
+
+import MIGRATION_7_TO_8 from '~/../docs/MIGRATION_7_TO_8.md?raw';
+
+<Meta title="DLS/Migration Guide (v.8)" />
+
+<Markdown>{MIGRATION_7_TO_8}</Markdown>