Removed old PHP code, migrated to Python and Flask

Update .dockerignore, .env, and 503 more files...

templates/elements/button.jinja

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+<button class="p-mxs r-s border b-light t-nowrap {{ button_extra_classes }}"
+        {% if button_disabled %}disabled{% endif %}>
+    {{ button_inner_html }}
+</button>

templates/elements/heading.jinja

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+{% if heading_anchor_id is not none %}
+<a class="bland-link" href="#{{ heading_anchor_id }}">
+{% endif %}
+
+<div class="heading-main p-xs border r-s
+        {% if heading_level == 3 %}
+            mt-l
+        {% elif heading_level == 4 %}
+            mt-m
+        {% endif %}
+        {{ heading_background_class }}">
+
+    <h{{ heading_level }} class="t-w-500
+            {% if heading_level == 2 %}
+                 t-size-16
+            {% else %}
+                {% if heading_level == 3 %}
+                    t-size-12
+                {% else %}
+                    t-size-10
+                {% endif %}
+            {% endif %}">
+
+        {% if heading_icon is not none %}
+        <i class="{{ heading_icon }} t-muted"></i>
+        {% endif %}
+
+        {{ heading_inner_html }}
+
+        {% if heading_right_html is not none %}
+        <span class="ml-auto mobile-hide t-size-10 t-muted">{{ heading_right_html }}</span>
+        {% endif %}
+
+    </h{{ heading_level }}>
+</div>
+
+{% if heading_anchor_id is not none %}
+</a>
+{% endif %}

templates/elements/image.jinja

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+<img src="" alt="">

templates/elements/paragraph.jinja

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+<p class="mt-xs mx-s">
+    {{ paragraph_inner_html }}
+</p>

templates/elements/splide.jinja

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+<section class="splide border bkgd-math r-s">
+    <div class="splide__track r-s">
+        <ul class="splide__list">
+            {% for inner_html_pane in splide_inner_html_panes %}
+                <li class="splide__slide">{{ inner_html_pane }}</li>
+            {% endfor %}
+        </ul>
+    </div>
+</section>