fix(docs): prefix blog post card hrefs with base_url (#1552)

`post.url` resolves to a root-absolute path (`/blog/...`) and drops the
`/noir` base path when the site is served from a GitHub Pages
subdirectory. Clicking a card from the blog index or an author page
landed on `https://owasp-noir.github.io/blog/...` (404) instead of
`/noir/blog/...`. Prefix with `{{ base_url }}` to match how every other
nav/footer link in the templates is built.

Author: hahwul

docs/templates/blog_section.html

@@ -25,7 +25,7 @@ <h1 class="blog-hero-title">
     <ul class="blog-post-list">
       {% for post in section.pages %}
       <li class="blog-post-card">
-        <a class="blog-post-card-link" href="{{ post.url }}">
+        <a class="blog-post-card-link" href="{{ base_url }}{{ post.url }}">
           <div class="blog-post-card-meta">
             <time datetime="{{ post.date }}">{{ post.date }}</time>
             {% if post.authors %}

docs/templates/taxonomy_term.html

@@ -61,7 +61,7 @@ <h2 class="blog-author-posts-title">
         {% set keep = (page.language == "ko" and is_ko) or (page.language != "ko" and not is_ko) %}
         {% if keep %}
         <li class="blog-post-card">
-          <a class="blog-post-card-link" href="{{ post.url }}">
+          <a class="blog-post-card-link" href="{{ base_url }}{{ post.url }}">
             <div class="blog-post-card-meta">
               <time datetime="{{ post.date }}">{{ post.date }}</time>
             </div>