docs handling

http/views/play/play.html

@@ -8,6 +8,9 @@
 <div style="max-width: 960px; margin: 10px auto; text-align: center;">
     <div class="btn-group" role="group" aria-label="Game controls">
         <a href="/releases/{{.Software.Name}}" class="btn btn-primary">Back to Releases</a>
+        {{if .WebPlayableRelease.DocsFolderPath}}
+            <a href="/docs/{{.Software.Name}}/{{.WebPlayableRelease.Version}}" class="btn btn-info">Docs</a>
+        {{end}}
         <button id="fullscreenButton" class="btn btn-secondary">Fullscreen</button>
     </div>
 </div>

http/views/software/show.html

@@ -17,6 +17,9 @@
             <div class="card-footer">
                 <div class="btn-group d-flex justify-content-center" role="group" aria-label="Game controls">
                     <button id="fullscreenButton" class="btn btn-secondary btn-sm">Fullscreen</button>
+                    {{if .WebPlayableRelease.DocsFolderPath}}
+                        <a href="/docs/{{.Software.Name}}/{{.WebPlayableRelease.Version}}" class="btn btn-info btn-sm">Docs</a>
+                    {{end}}
                 </div>
             </div>
         </div>
@@ -85,6 +88,9 @@
                         class="btn btn-primary btn-sm">Source</a>
                     <a href="/download/{{$.Software.Name}}/{{.Version}}/cartridge"
                         class="btn btn-primary btn-sm">Cartridge</a>
+                    {{if .DocsFolderPath}}
+                        <a href="/docs/{{$.Software.Name}}/{{.Version}}" class="btn btn-info btn-sm">Docs</a>
+                    {{end}}
                 </div>
             </div>
         </div>