Fix image source paths in Python installation instructions

Author: tmorrell

_includes/install_instructions/python.html

@@ -59,7 +59,7 @@ <h3>Python</h3>
                     <li>Right click on the "Downloads" folder in the left-hand navigation pane</li>
                     <li>Select "Properties"</li>
                     <li>In the "Location" tab, ensure that the path is set to <code>C:\Users\[your-username]\Downloads</code></li>
-                    <img src="assets/img/onedrive_downloads_location.png" alt="OneDrive Downloads Location">
+                    <img src="/assets/img/onedrive_downloads_location.png" alt="OneDrive Downloads Location">
                   </ul>
                 </p>
                 <strong>If you encounter problems, please contact your IT support team and workshop organisers for assistance before the workshop.</strong>
@@ -105,7 +105,7 @@ <h3>Python</h3>
           <li>Search for the application "Miniforge Prompt", and click the icon to open it.
             <ul>
               <li>Once open, ensure the prompt shows your <code>C:\Users\[your-username]</code> folder. If it does, continue to Step 8 below:<br/>
-                <img src="assets/img/miniforge_prompt.png" alt="Miniforge Prompt [your-username] as froggleston"><br/>
+                <img src="/assets/img/miniforge_prompt.png" alt="Miniforge Prompt [your-username] as froggleston"><br/>
                 In this case, the prompt shows <code>C:\Users\froggleston</code>. Your username will be different!
               </li>
               <li>If it doesn't:
@@ -114,7 +114,7 @@ <h3>Python</h3>
                     <li>Your username will be shown as <code>[machine-name]\[your-username]</code>. You only need the <code>[your-username]</code> part after the slash, i.e. <code>froggleston</code> in this example.</li>
                     <li>Type <code>cd C:\Users\[your-username]</code> and press <kbd>Enter</kbd></li>
                 </ul>
-                <img src="assets/img/miniforge_prompt_whoami.png" alt="Miniforge Prompt whoami">
+                <img src="/assets/img/miniforge_prompt_whoami.png" alt="Miniforge Prompt whoami">
                 <ul>
                     <li>Continue to Step 8 below</li>
                 </ul>