Search input field must be part of the tab cycle

Signed-off-by: Hofi <hofione@gmail.com>

Author: HofiOne

_includes/search/search_form.html

@@ -6,7 +6,7 @@
     <label class="sr-only" for="search">
       {{ site.data.ui-text[site.locale].search_label_text | default: 'Enter your search term...' }}
     </label>
-    <input type="search" id="search" class="search-input" tabindex="-1" placeholder="{{ site.data.ui-text[site.locale].search_placeholder_text | default: 'Enter your search term...' }}" />
+    <input type="search" id="search" class="search-input" placeholder="{{ site.data.ui-text[site.locale].search_placeholder_text | default: 'Enter your search term...' }}" />
     <a class="search-help content-tooltip full-content-tooltip nav-link" href="/lunr_search_help.html">[ Hover or click for search help ]</a>
   </form>
   <div id="results" class="results"></div>
@@ -15,7 +15,7 @@
     <label class="sr-only" for="cse-search-input-box-id">
       {{ site.data.ui-text[site.locale].search_label_text | default: 'Enter your search term...' }}
     </label>
-    <input type="search" id="cse-search-input-box-id" class="search-input" tabindex="-1" placeholder="{{ site.data.ui-text[site.locale].search_placeholder_text | default: 'Enter your search term...' }}" />
+    <input type="search" id="cse-search-input-box-id" class="search-input" placeholder="{{ site.data.ui-text[site.locale].search_placeholder_text | default: 'Enter your search term...' }}" />
   </form>
   <div id="results" class="results">
     <gcse:searchresults-only></gcse:searchresults-only>