feat: capitalize PDS and add link to official docs

- capitalize Personal Data Server (PDS) throughout
- link first mention in info modal to atproto.com/guides/overview
- update meta descriptions and onboarding text

src/templates.rs

···
     <meta property="og:type" content="website">
     <meta property="og:url" content="https://at-me.fly.dev/">
     <meta property="og:title" content="@me - explore your atproto identity">
-    <meta property="og:description" content="visualize your decentralized identity and see what apps have stored data in your personal data server">
+    <meta property="og:description" content="visualize your decentralized identity and see what apps have stored data in your Personal Data Server">
     <meta property="og:image" content="https://at-me.fly.dev/static/og-image.png">
 
     <!-- Twitter -->
     <meta property="twitter:card" content="summary_large_image">
     <meta property="twitter:url" content="https://at-me.fly.dev/">
     <meta property="twitter:title" content="@me - explore your atproto identity">
-    <meta property="twitter:description" content="visualize your decentralized identity and see what apps have stored data in your personal data server">
+    <meta property="twitter:description" content="visualize your decentralized identity and see what apps have stored data in your Personal Data Server">
     <meta property="twitter:image" content="https://at-me.fly.dev/static/og-image.png">
 
     <style>
···
     <meta property="og:type" content="website">
     <meta property="og:url" content="https://at-me.fly.dev/">
     <meta property="og:title" content="@me - explore your atproto identity">
-    <meta property="og:description" content="visualize your decentralized identity and see what apps have stored data in your personal data server">
+    <meta property="og:description" content="visualize your decentralized identity and see what apps have stored data in your Personal Data Server">
     <meta property="og:image" content="https://at-me.fly.dev/static/og-image.png">
 
     <!-- Twitter -->
     <meta property="twitter:card" content="summary_large_image">
     <meta property="twitter:url" content="https://at-me.fly.dev/">
     <meta property="twitter:title" content="@me - explore your atproto identity">
-    <meta property="twitter:description" content="visualize your decentralized identity and see what apps have stored data in your personal data server">
+    <meta property="twitter:description" content="visualize your decentralized identity and see what apps have stored data in your Personal Data Server">
     <meta property="twitter:image" content="https://at-me.fly.dev/static/og-image.png">
 
     <style>
···
     <div class="info-modal" id="infoModal">
         <h2>@me - your repository</h2>
         <p>on traditional social platforms, your content is locked in. want to switch? you start from zero. you build their network, they control the distribution.</p>
-        <p>on atproto, you own everything. your data lives in your personal server. apps like bluesky, whitewind, and frontpage just write to YOUR space. switch apps anytime, take it all with you.</p>
+        <p>on atproto, you own everything. your data lives in your <a href="https://atproto.com/guides/overview" target="_blank" rel="noopener noreferrer" style="color: var(--text); text-decoration: underline;">Personal Data Server (PDS)</a>. apps like bluesky, whitewind, and frontpage just write to YOUR space. switch apps anytime, take it all with you.</p>
         <p>click your @ in the center to see what you've built. click any app to see what it's stored in your repository.</p>
         <button id="closeInfo">got it</button>
         <button id="restartTour" onclick="window.restartOnboarding()" style="margin-left: 0.5rem; background: var(--surface-hover);">restart tour</button>

static/onboarding.js

···
     {
         target: '.identity',
         title: 'this is you',
-        description: 'your global identity and handle. your data is hosted at your personal data server (pds).',
+        description: 'your global identity and handle. your data is hosted at your Personal Data Server (PDS).',
         position: 'bottom'
     },
     {
         target: '.canvas',
         title: 'third-party applications',
-        description: 'these apps use your global identity to write public records to your pds. they can also read records you\'ve created.',
+        description: 'these apps use your global identity to write public records to your PDS. they can also read records you\'ve created.',
         position: 'center'
     },
     {
         target: '.app-view',
         title: 'explore your records',
-        description: 'click any app to see what records it has written to your pds.',
+        description: 'click any app to see what records it has written to your PDS.',
         position: 'bottom'
     }
 ];