docs: add frontmatter (title + description) to all doc pages

Required for the agent-friendly docs plugin to generate proper
llms.txt entries and markdown endpoint headings.

Author: marc0olo

docs/concepts/build-deploy-sync.md

@@ -1,3 +1,8 @@
+---
+title: Build, Deploy, Sync
+description: Understand the three phases that move canister source code to a running, configured state on the Internet Computer.
+---
+
 # Build, Deploy, Sync
 
 Canisters go through three distinct phases when moving from source code to running on the Internet Computer.

docs/concepts/environments.md

@@ -1,3 +1,8 @@
+---
+title: Environments and Networks
+description: Learn how networks and environments relate to control where and how canisters are deployed.
+---
+
 # Environments and Networks
 
 Understanding the relationship between networks and environments is key to effective deployment management.

docs/concepts/index.md

@@ -1,3 +1,8 @@
+---
+title: Concepts
+description: Overview of core icp-cli concepts including project model, build lifecycle, environments, recipes, and canister discovery.
+---
+
 # Concepts
 
 Understanding how icp-cli organizes and manages your project.

docs/concepts/project-model.md

@@ -1,3 +1,8 @@
+---
+title: Project Model
+description: How icp-cli discovers, loads, and consolidates project configuration from icp.yaml and related manifest files.
+---
+
 # Project Model
 
 This document explains how icp-cli discovers, loads, and consolidates your project configuration.

docs/concepts/recipes.md

@@ -1,3 +1,8 @@
+---
+title: Recipes
+description: How recipes use Handlebars templates to generate reusable build and sync configurations, reducing canister boilerplate.
+---
+
 # Recipes
 
 Recipes are templated build configurations that generate build and sync steps. They reduce boilerplate and encode best practices for common patterns.

docs/guides/containerized-networks.md

@@ -1,3 +1,8 @@
+---
+title: Using Containerized Networks
+description: Run ICP test networks inside Docker containers for isolated, reproducible local development and CI/CD pipelines.
+---
+
 # Using Containerized Networks
 
 Run ICP test networks in Docker containers for isolated, reproducible development environments.

docs/guides/creating-recipes.md

@@ -1,3 +1,8 @@
+---
+title: Creating Recipes
+description: Author custom Handlebars-based recipe templates to encode build conventions and share them across projects.
+---
+
 # Creating Recipes
 
 Recipes are reusable build templates that you can create to encode your team's build conventions or share them with the community.

docs/guides/creating-templates.md

@@ -1,3 +1,8 @@
+---
+title: Creating Project Templates
+description: Create custom project templates for icp new using cargo-generate to scaffold new ICP projects.
+---
+
 # Creating Project Templates
 
 Project templates let users scaffold new ICP projects with `icp new`. This guide covers creating custom templates for your team or the community.

docs/guides/deploying-to-mainnet.md

@@ -1,3 +1,8 @@
+---
+title: Deploying to IC Mainnet
+description: Set up an identity, obtain cycles, and deploy canisters to the Internet Computer mainnet.
+---
+
 # Deploying to IC Mainnet
 
 This guide walks through deploying your canisters to the Internet Computer mainnet.

docs/guides/deploying-to-specific-subnets.md

@@ -1,3 +1,8 @@
+---
+title: Deploying to Specific Subnets
+description: Target specific Internet Computer subnets for geographic, replication, or colocation requirements when deploying canisters.
+---
+
 # Deploying to Specific Subnets
 
 The Internet Computer is composed of independent [subnets](https://learn.internetcomputer.org/hc/en-us/articles/34209955782420-Subnet-Creation) — each a blockchain that hosts canisters. By default, icp-cli selects a subnet automatically, but you can target specific subnets when needed.