✨💄 app, frontend: Improve projects page layout and content

- Commented out the "Posts" link in the navigation menu.
- Changed projects page title to "Project Portfolio" and increased list gap to 3rem.
- Added new project summary for "HiveMQ Data Hub Scripting".
- Appended "(personal)" to personal project titles for clarity.
- Made `image` prop optional in `ProjectSummary` component and added conditional rendering.
- Removed image from "Endolingual" project summary.
- Lightened `--border-color` CSS variable to `oklch(40% 0 0)`.
- Added border styling to project images.
- Added padding to project description paragraphs.

crates/app/src/lib.rs

@@ -81,9 +81,9 @@ pub fn App() -> impl IntoView {
                                     <li>
                                         <A href="/">"Home"</A>
                                     </li>
-                                    <li>
-                                        <A href="/posts">"Posts"</A>
-                                    </li>
+                                    // <li>
+                                    //     <A href="/posts">"Posts"</A>
+                                    // </li>
                                     <li>
                                         <A href="/projects">"Projects"</A>
                                     </li>