Use series list for structuring docs index

No need for the draft boolean, we already have this information in the
project structure.

Author: dmnks

_data/projects.yml

@@ -24,26 +24,22 @@
     pattern: '\(RhBug:([0-9]+)\)'
   docs:
     - series: 4.20.x
-      draft: false
       build: |
         podman build --target base --tag rpm/web -f tests/Dockerfile .
         podman run -it --rm -v $PWD:/srv:z --workdir /srv rpm/web sh -c \
           "cmake -B _build -DWITH_DOXYGEN=ON && make -C _build apidoc"
         cp -r _build/docs/html $DESTDIR/api
         cp -r _build/docs/index.md docs/manual docs/man $DESTDIR/
     - series: 4.19.x
-      draft: false
       build: |
         podman build --target base --tag rpm/web -f tests/Dockerfile .
         podman run -it --rm -v $PWD:/srv:z --workdir /srv rpm/web sh -c \
           "cmake -B _build -DENABLE_TESTSUITE=OFF && make -C _build apidoc"
         cp -r _build/docs/html $DESTDIR/api
         cp -r _build/docs/index.md docs/manual docs/man $DESTDIR/
     - series: 6.1.x
-      draft: true
       baseurl: https://rpm-software-management.github.io/rpm
     - series: 6.0.x
-      draft: true
       build: |
         podman build --target base --tag rpm/web -f tests/Dockerfile .
         podman run -it --rm -v $PWD:/srv:z --workdir /srv rpm/web sh -c \

docs/index.html

@@ -4,28 +4,25 @@
 ---
 
 {% assign project = site.data.projects | where: "name", "rpm" | first %}
+{% assign docs = project.docs | sort: "series" | reverse %}
 
 <h2>Documentation</h2>
 <p>Reference documentation shipped with RPM.</p>
 
 <h3>Stable Releases</h3>
-{% assign docs = project.docs |
-    where: "draft", false |
-    sort: "series" | reverse %}
 <ul>
 {% for tree in docs %}
+    {% if project.stable contains tree.series %} {% else %} {% continue %} {% endif %}
     <li>
         <a href="{{ tree.series }}/">{{ project.title }} {{ tree.series }}</a>
     </li>
 {% endfor %}
 </ul>
 
 <h3>Development</h3>
-{% assign docs = project.docs |
-    where: "draft", true |
-    sort: "series" | reverse %}
 <ul>
 {% for tree in docs %}
+    {% if project.stable contains tree.series %} {% continue %} {% endif %}
     {% if tree.baseurl %}
         {% assign baseurl = tree.baseurl %}
     {% else %}