[Doc] Add docs index page

Signed-off-by: pdmurray <peynmurray@gmail.com>

doc/source/_static/css/splash.css

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+.image-header {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    padding-left: 16px;
+    padding-right:16px;
+    gap: 16px;
+}
+
+.info-box {
+    background-color: var(--pst-color-surface);
+    box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.05);
+    border-radius: 8px;
+    padding: 20px;
+}
+
+.info-box:hover{
+    box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.1);
+}
+
+.no-underline{
+    text-decoration: none;
+}
+.no-underline:hover{
+    text-decoration: none;
+}
+
+.icon-hover:hover{
+    height: 30px ;
+    width: 30px;
+}
+
+.info-box-2 {
+    background-color: var(--pst-color-surface);
+    border-radius: 8px;
+    padding-right: 16px;
+    padding-left: 16px;
+    padding-bottom: 24px;
+    padding-top: 4px;
+}
+
+
+.bold-link {
+    color: var(--pst-color-link) !important;
+    font-weight: 600;
+}
+
+.community-box {
+    border: 1px solid var(--pst-color-border);
+    border-radius: 8px;
+    display: flex;
+    margin-bottom: 16px;
+}
+
+.community-box:hover {
+    box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.05);
+    text-decoration: none;
+}
+
+.community-box p {
+    margin-top: 1rem !important;
+}
+
+.tab-pane pre {
+    margin: 0;
+    padding: 0;
+    max-height: 252px;
+    overflow-y: auto;
+    animation: fadeEffect 1s; /* Fading effect takes 1 second */
+}
+
+.grid-container {
+    display: grid;
+    grid-template-columns: repeat(3, 1fr);
+    grid-gap: 16px;
+}
+
+.grid-item {
+padding: 20px;
+}
+
+.nav-pills {
+    background-color: var(--pst-color-surface);
+    padding: 8px;
+    border-bottom:none;
+    border-radius: 8px;
+}
+
+.nav-pills .nav-link.active {
+    background-color: var(--pst-color-background) !important;
+    box-shadow: 0px 3px 14px 2px var(--pst-color-shadow);
+    border-radius: 8px;
+    padding-top: 1rem;
+    padding-bottom: 1rem;
+    color: var(--pst-color-text-base);
+    font-weight: 500;
+}
+
+#v-pills-tab > .nav-link:hover {
+  text-decoration: none;
+}
+
+#v-pills-tab > a {
+  cursor: pointer;
+}
+
+#v-pills-tab > .nav-link {
+  color: var(--pst-color-text-base);
+}
+
+#v-pills-tabContent {
+  box-shadow: 0px 6px 30px 5px var(--pst-color-shadow);
+  border-radius:8px;
+}
+
+#v-pills-data {
+  user-select: none;
+}
+
+/* Go from zero to full opacity */
+@keyframes fadeEffect {
+  from {opacity: 0;}
+  to {opacity: 1;}
+}
+
+#ray-intro-video {
+  width: 100%;
+  height: 100%;
+  border-radius: 10px;
+}

doc/source/_static/js/splash.js

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+function animateTabs() {
+  const tabs = Array.from(document.getElementById("v-pills-tab").children)
+  const contentTabs = Array.from(document.getElementById("v-pills-tabContent").children)
+
+  tabs.forEach((item, index) => {
+    item.onclick = () => {
+      tabs.forEach((tab, i) => {
+        if (i === index) {
+          item.classList.add('active')
+        } else {
+          tab.classList.remove('active')
+        }
+      })
+      contentTabs.forEach((tab, i) => {
+        if (i === index) {
+          tab.classList.add('active', 'show')
+        } else {
+          tab.classList.remove('active', 'show')
+        }
+      })
+    }
+  })
+}
+
+document.addEventListener("DOMContentLoaded", animateTabs)
+document.addEventListener("DOMContentLoaded", () => hljs.highlightAll())

doc/source/index.rst

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+:html_theme.sidebar_secondary.remove:
+
+.. title:: Welcome to Ray!
+
+.. toctree::
+   :hidden:
+
+   Overview <ray-overview/index>
+   Getting Started <ray-overview/getting-started>
+   Installation <ray-overview/installation>
+   Use Cases <ray-overview/use-cases>
+   Example Gallery <ray-overview/examples>
+   Ecosystem <ray-overview/ray-libraries>
+   Ray Core <ray-core/walkthrough>
+   Ray Data <data/data>
+   Ray Train <train/train>
+   Ray Tune <tune/index>
+   Ray Serve <serve/index>
+   Ray RLlib <rllib/index>
+   More Libraries <ray-more-libs/index>
+   Ray Clusters <cluster/getting-started>
+   Monitoring and Debugging <ray-observability/index>
+   Developer Guides <ray-contribute/index>
+   Glossary <ray-references/glossary>
+   Security <ray-security/index>
+
+.. raw:: html
+   :file: splash.html