Feature: search suggestions for search and quick launch (#2775)

---------

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

docs/widgets/info/search.md

@@ -9,6 +9,7 @@ You can add a search bar to your top widget area that can search using Google, D
 - search:
     provider: google # google, duckduckgo, bing, baidu, brave or custom
     focus: true # Optional, will set focus to the search bar on page load
+    showSearchSuggestions: true # Optional, will show search suggestions. Defaults to false
     target: _blank # One of _self, _blank, _parent or _top
 ```
 
@@ -17,8 +18,10 @@ or for a custom search:
 ```yaml
 - search:
     provider: custom
-    url: https://lougle.com/?q=
+    url: https://www.ecosia.org/search?q=
     target: _blank
+    suggestionUrl: https://ac.ecosia.org/autocomplete?type=list&q= # Optional
+    showSearchSuggestions: true # Optional
 ```
 
 multiple providers is also supported via a dropdown (excluding custom):
@@ -28,4 +31,25 @@ multiple providers is also supported via a dropdown (excluding custom):
     provider: [brave, google, duckduckgo]
 ```
 
+The response body for the URL provided with the `suggestionUrl` option should look like this:
+
+```json
+[
+  "home",
+  [
+    "home depot",
+    "home depot near me",
+    "home equity loan",
+    "homeworkify",
+    "homedepot.com",
+    "homebase login",
+    "home depot credit card",
+    "home goods"
+  ]
+]
+```
+
+The first entry of the array contains the search query, the second one is an array of the suggestions.
+In the example above, the search query was **home**.
+
 _Added in v0.1.6, updated in 0.6.0_