feat(*): refactor dynamic vs. static structure and distinctions; make additional elements dynamic

src/includes/static/blocks/banners/calendar.liquid

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+<div class="banner calendar">
+  <p>{% tablericon "calendar" %} <a href="{{ url }}">{{ text }}</a>.</p>
+</div>

src/includes/static/blocks/banners/forgejo.liquid

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+<div class="banner forgejo">
+  <p>{% tablericon "git-merge" %} Take a look at <a href="{{ url }}">the repository for this project</a> on my <a href="https://forgejo.org">Forgejo</a> instance.</p>
+</div>

src/includes/static/blocks/banners/github.liquid

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+<div class="banner github">
+  <p>{% tablericon "brand-github" %} Take a look at <a href="{{ url }}">the GitHub repository for this project</a>. (Give it a star if you feel like it.)</p>
+</div>

src/includes/static/blocks/banners/npm.liquid

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+<div class="banner npm">
+  <p>{% tablericon "brand-npm" %} <a href="{{ url }}">You can take a look at this package on NPM</a> or install it by running <code>{{ command }}</code>.</p>
+</div>

src/includes/static/blocks/banners/old-post.liquid

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+{%- if isOldPost -%}
+  <div class="banner old-post">
+    <p>{% tablericon "clock-x" %} This post is over 3 years old. I've probably changed my mind since it was written and it <em>could</em> be out of date.</p>
+  </div>
+{%- endif -%}

src/includes/static/blocks/banners/rss.liquid

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+<div class="banner rss">
+  <p>{% tablericon "rss" %} <a href="{{ url }}">{{ text }}</a>.</p>
+</div>

src/includes/static/blocks/banners/warning.liquid

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+<div class="banner warning">
+  <p>{% tablericon "alert-triangle" %} {{ text }}</p>
+</div>