Add blog post about Dangerzone integration.

This PR depends on #10936.

It adds a blog post about Dangerzone & gVisor integration. The same blog post is being posted on the Dangerzone blog: freedomofpress/dangerzone.rocks#48

When published, it will appear at the following URL: `https://gvisor.dev/blog/2024/09/23/safe-ride-into-the-dangerzone/`

Preview:
![dangerzone-preview](https://github.com/user-attachments/assets/be889fb4-0b49-4bdb-931d-8a06a6b1e265)
FUTURE_COPYBARA_INTEGRATE_REVIEW=#10937 from EtiennePerot:dangerzone-blog-post 136b0af
PiperOrigin-RevId: 677215115

website/_config.yml

@@ -27,6 +27,14 @@ defaults:
       layout: default
 analytics: "UA-150193582-1"
 authors:
+  almet:
+    name: Alexis Métaireau
+    email: [email protected]
+    url: https://notmyidea.org
+  apyrgio:
+    name: Alex Pyrgiotis
+    email: [email protected]
+    url: https://freedom.press/people/alex-p
   ayushranjan:
     name: Ayush Ranjan
     email: [email protected]

website/_sass/style.scss

@@ -183,7 +183,7 @@ table th {
   margin: 20px auto;
 }
 
-.blog-content .attribution {
+.blog-content .attribution, .blog-content figcaption {
   /* Stay close to the image. */
   display: block;
   margin-top: 6px;
@@ -195,13 +195,20 @@ table th {
   color: $text-color-secondary;
 }
 
-.blog-content * img:has(+ .attribution) {
+.blog-content * img:has(+ .attribution), .blog-content * img:has(+ figcaption) {
   /* Remove bottom margins from images where there is an attribution line
    * immediately following the image.
    */
   margin-bottom: 0px;
 }
 
+.blog-content .attribution, .blog-content figcaption {
+  /* Remove margin above image caption. */
+  margin-top: 0px;
+  /* Add margin under image caption. */
+  margin-bottom: 1em;
+}
+
 .blog-content details {
   margin-left: 2em;
   margin-right: 2em;

website/blog/BUILD

@@ -141,6 +141,18 @@ doc(
     permalink = "/blog/2024/02/01/seccomp/",
 )
 
+doc(
+    name = "dangerzone",
+    src = "2024-09-23-dangerzone.md",
+    authors = [
+        "almet",
+        "apyrgio",
+        "eperot",
+    ],
+    layout = "post",
+    permalink = "/blog/2024/09/23/safe-ride-into-the-dangerzone/",
+)
+
 docs(
     name = "posts",
     deps = [