chore(docs): add default values for docs.yml settings config

Author: dannysheridan

fern/products/docs/pages/customization/what-is-docs-yml.mdx

@@ -455,7 +455,7 @@ layout:
 
 ```yaml docs.yml
 settings:
-  search-text: "Search the docs..."
+  search-text: "Search"
   disable-search: false
   dark-mode-code: true
   default-search-filters: true
@@ -468,31 +468,31 @@ settings:
   The text to display in the searchbar.
 </ParamField>
 
-<ParamField path="settings.disable-search" type="boolean" required={false}>
+<ParamField path="settings.disable-search" type="boolean" required={false} default="false">
   If set to true, the searchbar will be disabled. Use this if you want to use a custom search solution.
 </ParamField>
 
-<ParamField path="settings.dark-mode-code" type="boolean" required={false}>
+<ParamField path="settings.dark-mode-code" type="boolean" required={false} default="false">
   If set to true, the code blocks will be displayed in dark mode, regardless of the selected theme.
 </ParamField>
 
-<ParamField path="settings.default-search-filters" type="boolean" required={false}>
+<ParamField path="settings.default-search-filters" type="boolean" required={false} default="false">
   By default, search will display results for pages across all products and versions. 
 
   If set to true, search will display results for pages within the current product and version.
 </ParamField>
 
-<ParamField path="settings.http-snippets" type="boolean" required={false}>
+<ParamField path="settings.http-snippets" type="boolean" required={false} default="false">
   If set to true, the HTTP snippets will be displayed in the API Reference.
 </ParamField>
 
-<ParamField path="settings.hide-404-page" type="boolean" required={false}>
+<ParamField path="settings.hide-404-page" type="boolean" required={false} default="false">
   If set to true, when a user navigates to a page that does not exist, they will be redirected to the home page.
 
   By default, a 404 page will be displayed.
 </ParamField>
 
-<ParamField path="settings.use-javascript-as-typescript" type="boolean" required={false}>
+<ParamField path="settings.use-javascript-as-typescript" type="boolean" required={false} default="false">
   If set to true, the TypeScript snippets will be displayed as JavaScript snippets in the API Reference.
 </ParamField>