chore: add two static files

The webfinger is my general Mastodon alias.

I use sometimes the CSS files in my emails to stylize them a bit.

content/.vuepress/public/css/email.css

@@ -0,0 +1,18 @@
+body {
+  margin: 3em;
+}
+
+body, code,p {
+  background: #e5e9f0 !important;
+  line-height: 1.4 !important;
+  color: #2E3440;
+  font-size: 16px !important;
+}
+
+blockquote, blockquote p {
+    border-left-color: #3b4252;
+}
+
+pre {
+    padding: 10px;
+}