Refactor web build process and update documentation

- Removed Node.js build artifacts from .gitignore and adjusted Makefile to reflect changes in web UI build process, now using server-rendered Go templates instead of React.
- Updated README to clarify the new web UI architecture and output formats, emphasizing the removal of the Node.js build step.
- Added a command to set the number of frames per render task in manager configuration, enhancing user control over rendering settings.
- Improved Gitea workflow by removing unnecessary npm install step, streamlining the CI process.

web/templates/partials/job_tasks.html

@@ -0,0 +1,37 @@
+{{ define "partial_job_tasks" }}
+{{ $tasks := index . "tasks" }}
+{{ if not $tasks }}
+<p>No tasks yet.</p>
+{{ else }}
+<table class="table">
+  <thead>
+    <tr>
+      <th>ID</th>
+      <th>Type</th>
+      <th>Status</th>
+      <th>Frame(s)</th>
+      <th>Step</th>
+      <th>Retries</th>
+      <th>Error</th>
+      <th>Logs</th>
+    </tr>
+  </thead>
+  <tbody>
+  {{ range $task := $tasks }}
+    <tr>
+      <td>{{ $task.ID }}</td>
+      <td>{{ $task.TaskType }}</td>
+      <td><span class="status {{ statusClass $task.Status }}">{{ $task.Status }}</span></td>
+      <td>{{ $task.Frame }}{{ if $task.FrameEnd }}-{{ derefInt $task.FrameEnd }}{{ end }}</td>
+      <td>{{ if $task.CurrentStep }}{{ $task.CurrentStep }}{{ else }}-{{ end }}</td>
+      <td>{{ $task.RetryCount }}</td>
+      <td>{{ if $task.Error }}{{ $task.Error }}{{ else }}-{{ end }}</td>
+      <td>
+        <button class="btn tiny" data-view-logs-task-id="{{ $task.ID }}">View logs</button>
+      </td>
+    </tr>
+  {{ end }}
+  </tbody>
+</table>
+{{ end }}
+{{ end }}