refactor: adapt to nuspec requirement for gallery publishing

samples/default/confluence.out/manifest.json

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+{
+    "Pages": [
+        {
+            "Title": "Default Sample~",
+            "Ref": "pages/Default+Sample~.xml"
+        },
+        {
+            "Title": "Cats",
+            "Ref": "pages/Cats.xml",
+            "AncestorTitle": "Default Sample~"
+        }
+    ],
+    "Attachments": [
+        {
+            "Name": "pexels-just-a-couple-photos-3777622.jpg",
+            "ContainerPageTitle": "Cats",
+            "MimeType": "image/jpeg",
+            "Ref": "attachments/pexels-just-a-couple-photos-3777622.jpg"
+        },
+        {
+            "Name": "pexels-sami-aksu-14356302.jpg",
+            "ContainerPageTitle": "Cats",
+            "MimeType": "image/jpeg",
+            "Ref": "attachments/pexels-sami-aksu-14356302.jpg"
+        },
+        {
+            "Name": "objects.inv",
+            "ContainerPageTitle": "Default Sample~",
+            "MimeType": "application/octet-stream",
+            "Ref": "attachments/objects.inv"
+        }
+    ]
+}

samples/default/confluence.out/pages/Cats.xml

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+<p>What can we say… They secretly rule the world.</p><ac:image>
+<ri:attachment ri:filename="pexels-just-a-couple-photos-3777622.jpg"></ri:attachment>
+</ac:image><p>photo by: <a href="https://www.pexels.com/@jacp/">https://www.pexels.com/@jacp/</a></p><ac:image>
+<ri:attachment ri:filename="pexels-sami-aksu-14356302.jpg"></ri:attachment>
+</ac:image><p>photo by: <a href="https://www.pexels.com/@sami-aksu-48867324/">https://www.pexels.com/@sami-aksu-48867324/</a></p>

samples/default/confluence.out/pages/Default+Sample~.xml

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+<ac:structured-macro ac:name="info">
+<ac:rich-text-body><p><code>confluence_conf.py</code> is not required, it’s just a helper module to be able to configure <code>sphinxcontrib.confluencebuilder</code> through environment variables.</p></ac:rich-text-body>
+</ac:structured-macro>
+<p>To run this sample, <a href="https://pypi.org/project/pipenv/">pipenv</a> is required.</p><p>First, install the <em>venv</em> by executing the following command from within the <code>samples/default/</code> directory:</p><ac:structured-macro ac:name="code">
+<ac:parameter ac:name="language">python</ac:parameter>
+<ac:parameter ac:name="linenumbers">false</ac:parameter>
+<ac:plain-text-body><![CDATA[$ python3 -m pipenv install]]></ac:plain-text-body>
+</ac:structured-macro>
+<ac:structured-macro ac:name="info">
+<ac:rich-text-body><p>To contain the virtual environment within the current directory, create an empty directory named <code>.venv</code>.</p></ac:rich-text-body>
+</ac:structured-macro>
+<p>Afterwards, execute the following command:</p><ac:structured-macro ac:name="code">
+<ac:parameter ac:name="language">python</ac:parameter>
+<ac:parameter ac:name="linenumbers">false</ac:parameter>
+<ac:plain-text-body><![CDATA[$ python3 -m pipenv run build-sphinx]]></ac:plain-text-body>
+</ac:structured-macro>
+<p>The backend for the command can be inspected in <code>Pipfile</code>.</p><p>You should now have a directory</p><p style="clear: both;">Important Content</p>
+<ul>
+<li>
+<ac:link>
+<ri:page ri:content-title="Cats" />
+<ac:link-body>Cats</ac:link-body>
+</ac:link></li>
+</ul>