title: I get no image in the viewer panel when I run blogdown's serve_site()
body: <p>I used the following code to create the blogdown site with HUGO 0.88.1;</p>
  <pre><code>new_site(theme = 'puresyntax71/hugo-theme-chunky-poster',
           format = 'toml')
  </code></pre>
  <p>And as per the instructions I am following, a site is supposed to load on the viewer panel which is not happening.</p>
  <p>I have tried the check_site() function and within the results I get;</p>
  <pre><code>Checking .gitignore
  | Checking for items to remove...
  ○ Nothing to see here - found no items to remove.
  | Checking for items to change...
  ○ Nothing to see here - found no items to change.
  | Checking for items you can safely ignore...
  ○ Found! You have safely ignored: .DS_Store, Thumbs.db
  | Checking for items to ignore if you build the site on Netlify...
  ● [TODO] When Netlify builds your site, you can safely add to .gitignore: /public/, /resources/
  | Checking for files required by blogdown but not committed...
  ● [TODO] Found 1 file that should be committed in GIT:
  
    layouts/shortcodes/blogdown/postref.html
  </code></pre>
  <p>so I went to inspect the shortcode referred above which had the following content;</p>
  <pre><code>{{ if eq (getenv &quot;BLOGDOWN_POST_RELREF&quot;) &quot;true&quot; }}{{ .Page.RelPermalink }}{{ else }}{{ .Page.Permalink }}{{ end }}
  
  </code></pre>
  <p>How can I commit that file to GIT as instructed? And is that the reason I am not getting a preview of the site?</p>
  <p>NOTE: Important information I had not mentioned before; the following is the error code that I receive when I try to <code>serve_site()</code></p>
  <pre><code>Launching the server via the command:
    C:/Users/User/AppData/Roaming/Hugo/0.88.1/hugo.exe server --bind 127.0.0.1 -p 4321 --themesDir themes -t hugo-theme-chunky-poster -D -F --navigateToChanged
  Error: &quot;C:\Users\User\Documents\20210913_blogdown\web-tea\config.toml:1:1&quot;: unmarshal failed: toml: table markup already exists
  </code></pre>