docs: generate llms.txt and llms-full.txt (#465)

Add vitepress-plugin-llms to produce llms.txt (a curated, sidebar-ordered
index) and llms-full.txt (full docs concatenated) at build time, served at
docs.plane.so/llms.txt and /llms-full.txt for LLM/GEO consumption.

- Plugin owns llms.txt / llms-full.txt only; the existing buildEnd .md copy
  still serves the Accept: text/markdown rewrite, so per-page generation is
  disabled to avoid overlap.
- domain set for absolute URLs; richer description/details for the index.
- noindex / search:false pages excluded via ignoreFiles.
- injectLLMHint disabled to keep rendered pages untouched.

Author: sriramveeraghanta

docs/.vitepress/config.ts

@@ -5,6 +5,7 @@ import { dirname, join, relative, resolve } from "path";
 import { defineConfig, type HeadConfig } from "vitepress";
 import { extendConfig } from "@voidzero-dev/vitepress-theme/config";
 import { tabsMarkdownPlugin } from "vitepress-plugin-tabs";
+import llmstxt from "vitepress-plugin-llms";
 
 function loadEnvVar(key: string): string | undefined {
   // process.env takes precedence (CI/hosting platforms set vars here)
@@ -53,6 +54,33 @@ const config = defineConfig({
   description: "Modern project management software",
   cleanUrls: true,
 
+  vite: {
+    plugins: [
+      // Generates llms.txt and llms-full.txt from the docs and sidebar.
+      // https://github.com/okineadev/vitepress-plugin-llms
+      llmstxt({
+        domain: "https://docs.plane.so",
+        description:
+          "Plane is open-source, modern project management software for planning, tracking, and shipping work.",
+        details:
+          "This documentation covers workspaces, projects, work items, cycles, modules, pages and wikis, integrations, importers, automations, and Plane AI.",
+        // Per-page .md versions are already emitted by buildEnd() for the
+        // `Accept: text/markdown` rewrite in vercel.json, so the plugin only
+        // owns llms.txt / llms-full.txt.
+        generateLLMFriendlyDocsForEachPage: false,
+        // Don't inject invisible LLM-hint markup into rendered pages.
+        injectLLMHint: false,
+        // Pages hidden from search (search: false / noindex) are excluded
+        // from the LLM files too.
+        ignoreFiles: [
+          "core-concepts/issues.md",
+          "core-concepts/projects/run-project.md",
+          "importers/github-imp.md",
+        ],
+      }),
+    ],
+  },
+
   buildEnd(siteConfig) {
     // Copy source .md files into dist/ for Accept: text/markdown negotiation.
     const srcDir = siteConfig.srcDir;

package.json

@@ -29,7 +29,8 @@
   },
   "devDependencies": {
     "@types/node": "^25.6.0",
-    "oxfmt": "^0.36.0"
+    "oxfmt": "^0.36.0",
+    "vitepress-plugin-llms": "^1.13.1"
   },
   "engines": {
     "node": ">=24.0.0"