Implement filter in status, website and uri in CLI and Frontend

cmd/frontend/templates/index.html

@@ -13,6 +13,17 @@
 {{- end}}
 </div>
 
+<form class="filter-form" method="get" action="/">
+  <input type="hidden" name="target" value="{{.Params.Target}}">
+  <input type="hidden" name="w" value="{{.Params.WindowS}}">
+  <input type="hidden" name="by" value="{{.Params.GroupByS}}">
+  <input type="hidden" name="n" value="{{.Params.N}}">
+  <input class="filter-input" type="text" name="q" value="{{.FilterExpr}}" placeholder="status>=400 AND website~=gouda.* AND uri~=^/api/">
+  <button type="submit">filter</button>
+  {{- if .FilterExpr}} <a class="clear" href="{{.ClearFilterURL}}">× clear</a>{{end}}
+</form>
+{{- if .FilterErr}}<div class="filter-err">{{.FilterErr}}</div>{{end}}
+
 {{if .Breadcrumbs}}
 <div class="crumbs">
   <span class="label">Filters:</span>