feat: add gh-dashboard project, language switch partial, header alignment fix

- Add gh-dashboard (debba/gh-dashboard) as collaboration project in EN/ES CV data
- Add head-language-switch.html template partial with test
- Change CV header text-align-last from justify to left
- Update .gitignore to exclude prompt symlinks and cv-site binary

static/css/03-components/_cv-header.css

@@ -76,8 +76,8 @@
     margin-top: 20px;
     /* Full justification - spread text across entire width */
     text-align: justify;
-    text-align-last: justify;
-    -moz-text-align-last: justify;
+    text-align-last: left;
+    -moz-text-align-last: left;
     text-justify: inter-word;
     /* Word breaking and hyphenation */
     word-spacing: -1px;