UX: theme first, remove contact CTA buttons, Git label, skills preview

- Restore theme switcher to top of sidebar; drop LinkedIn/Email/Resume button row
- github.showInDetails, websiteLabel Git, skillsPreviewLimit, shorter about
- Details list links without bogus anchors; resume card view+download; footer Git

Made-with: Cursor

global.d.ts

@@ -1,8 +1,13 @@
 interface Github {
   /**
-   * GitHub org/user name
+   * GitHub org/user name (used for profile API: avatar, name)
    */
   username: string;
+
+  /**
+   * Show GitHub row in the contact/details card (default true)
+   */
+  showInDetails?: boolean;
 }
 
 interface GitHubProjects {
@@ -190,6 +195,11 @@ interface Social {
    */
   website?: string;
 
+  /**
+   * Label for the website row (default "Website"), e.g. "Git" for a Gitea host
+   */
+  websiteLabel?: string;
+
   /**
    * Telegram username
    */
@@ -365,6 +375,11 @@ interface Config {
    */
   skills?: Array<string>;
 
+  /**
+   * How many skill badges to show before "Show all" (default 16)
+   */
+  skillsPreviewLimit?: number;
+
   /**
    * Experience list
    */