content/static: fix directory indentation

Fixes golang/go#44399

Change-Id: I298986d2219a6c8333bfa7d49cb0bed9818f59e0
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/295591
Trust: Jamal Carvalho <jamal@golang.org>
Run-TryBot: Jamal Carvalho <jamal@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>

content/static/css/unit_directories.css

@@ -77,7 +77,9 @@ th.UnitDirectories-toggleCell {
 .UnitDirectories-toggleButton {
   background-color: transparent;
   border: none;
+  left: -0.75rem;
   margin: 0 -0.5rem -1rem -1rem;
+  position: absolute;
   vertical-align: top;
 }
 .UnitDirectories-subSpacer {
@@ -96,10 +98,14 @@ th.UnitDirectories-toggleCell {
   line-height: 1.75rem;
   word-break: break-all;
 }
+.UnitDirectories-pathCell > div {
+  position: relative;
+}
 .UnitDirectories-subdirectory {
   border-left: 0.0625rem solid var(--gray-8);
   display: flex;
   flex-direction: column;
+  margin-left: 0.375rem;
   padding: 0.5rem 1rem;
 }
 .UnitDirectories-mobileSynopsis {

content/static/html/helpers/_unit_directories.tmpl

@@ -52,8 +52,10 @@
             <tr data-id="{{$prefix}}-{{.Suffix}}">
               <td>
                 <div class="UnitDirectories-subdirectory">
-                  <a href="{{.URL}}">{{.Suffix}}</a>
-                  {{if .IsModule}}<span class="UnitHeader-badge">Module</span>{{end}}
+                  <span>
+                    <a href="{{.URL}}">{{.Suffix}}</a>
+                    {{if .IsModule}}<span class="UnitHeader-badge">Module</span>{{end}}
+                  </span>
                   <div class="UnitDirectories-mobileSynopsis">{{.Synopsis}}</div>
                 </div>
               </td>