dev: Remove old README, update docs

.env

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+# Gemini API Key for local development/testing
+# Note: For the GitHub Pages site, users will be prompted to enter their own API key
+# which is stored in their browser's localStorage (not shared with the server)
+# Get your free API key at: https://aistudio.google.com/apikey
+GEMINI_API_KEY=AIzaSyB1kLWIDXGvwikSQyAbqhytf3wHf65aulQ

docs/cloudflare-worker.js

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+/**
+ * TinyGPU Gemini API Proxy - Cloudflare Worker
+ *
+ * This worker proxies requests to the Gemini API, keeping your API key secure.
+ * Deploy this to Cloudflare Workers and set the GEMINI_API_KEY secret.
+ *
+ * Setup Instructions:
+ * 1. Go to https://dash.cloudflare.com/ and sign up/login
+ * 2. Go to Workers & Pages > Create Application > Create Worker
+ * 3. Name it something like "tinygpu-gemini-proxy"
+ * 4. Replace the default code with this file's contents
+ * 5. Go to Settings > Variables > Add Variable
+ *    - Name: GEMINI_API_KEY
+ *    - Value: Your Gemini API key
+ *    - Click "Encrypt" to keep it secret
+ * 6. Save and Deploy
+ * 7. Your worker URL will be: https://tinygpu-gemini-proxy.<your-subdomain>.workers.dev
+ */
+
+export default {
+  async fetch(request, env) {
+    // Handle CORS preflight
+    if (request.method === "OPTIONS") {
+      return new Response(null, {
+        headers: {
+          "Access-Control-Allow-Origin": "*",
+          "Access-Control-Allow-Methods": "POST, OPTIONS",
+          "Access-Control-Allow-Headers": "Content-Type",
+          "Access-Control-Max-Age": "86400",
+        },
+      });
+    }
+
+    // Only allow POST requests
+    if (request.method !== "POST") {
+      return new Response(JSON.stringify({ error: "Method not allowed" }), {
+        status: 405,
+        headers: {
+          "Content-Type": "application/json",
+          "Access-Control-Allow-Origin": "*",
+        },
+      });
+    }
+
+    try {
+      // Get the request body
+      const body = await request.json();
+
+      // Validate required fields
+      if (!body.prompt) {
+        return new Response(JSON.stringify({ error: "Missing prompt" }), {
+          status: 400,
+          headers: {
+            "Content-Type": "application/json",
+            "Access-Control-Allow-Origin": "*",
+          },
+        });
+      }
+
+      // Build Gemini API request
+      const geminiUrl = `https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent?key=${env.GEMINI_API_KEY}`;
+
+      const geminiPayload = {
+        contents: [{ parts: [{ text: body.prompt }] }],
+      };
+
+      // Add system instruction if provided
+      if (body.systemPrompt) {
+        geminiPayload.systemInstruction = {
+          parts: [{ text: body.systemPrompt }],
+        };
+      }
+
+      // Call Gemini API
+      const geminiResponse = await fetch(geminiUrl, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(geminiPayload),
+      });
+
+      if (!geminiResponse.ok) {
+        const errorText = await geminiResponse.text();
+        return new Response(
+          JSON.stringify({
+            error: "Gemini API error",
+            status: geminiResponse.status,
+            details: errorText,
+          }),
+          {
+            status: geminiResponse.status,
+            headers: {
+              "Content-Type": "application/json",
+              "Access-Control-Allow-Origin": "*",
+            },
+          }
+        );
+      }
+
+      const data = await geminiResponse.json();
+      const text =
+        data.candidates?.[0]?.content?.parts?.[0]?.text ||
+        "No response generated.";
+
+      return new Response(JSON.stringify({ text }), {
+        headers: {
+          "Content-Type": "application/json",
+          "Access-Control-Allow-Origin": "*",
+        },
+      });
+    } catch (error) {
+      return new Response(JSON.stringify({ error: error.message }), {
+        status: 500,
+        headers: {
+          "Content-Type": "application/json",
+          "Access-Control-Allow-Origin": "*",
+        },
+      });
+    }
+  },
+};