Add support for customizing the search input partial

layouts/partials/search-input.html

@@ -33,4 +33,6 @@
     data-offline-search-max-results="{{ .Site.Params.offlineSearchMaxResults | default 10 }}"
   >
 </div>
+{{ else if templates.Exists "partials/search-input-custom.html" -}}
+  {{ partialCached "search-input-custom" . }}
 {{ end -}}

userguide/content/en/docs/adding-content/navigation.md

@@ -316,6 +316,7 @@ Docsy offers multiple options that let your readers search your site content, so
 * [Google Custom Search Engine](#configure-search-with-a-google-custom-search-engine) (GCSE), the default option, which uses Google's index of your public site to generate a search results page.
 * [Algolia DocSearch](#configure-algolia-docsearch), which uses Algolia's indexing and search mechanism, and provides an organized dropdown of search results when your readers use the search box. Algolia DocSearch is free for public documentation sites.
 * [Local search with Lunr](#configure-local-search-with-lunr), which uses Javascript to index and search your site without the need to connect to external services. This option doesn't require your site to be public.
+* Custom search, which used to customize search input by creating the `layouts/partials/search-input-custom.html`, you'll need to disable other search options.
 
 If you enable any of these search options in your project [configuration file], a search box displays in the right of your top navigation bar. By default a search box also displays at the top of the section menu in the left navigation pane, which you can disable if you prefer, or if you're using a search option that only works with the top search box.