Use vscode-markdown to generate index

Signed-off-by: Emily Casey <ecasey@vmware.com>

buildpack.md

@@ -21,7 +21,7 @@ This is accomplished in two phases:
 2. **Development,** where the lifecycle uses those buildpacks to create a containerized development environment.
 
 ## Table of Contents
-
+<!-- Using https://github.com/yzhang-gh/vscode-markdown to manage toc -->
 1. [Buildpack Interface](#buildpack-interface)
    1. [Key](#key)
    2. [Detection](#detection)

platform.md

@@ -11,45 +11,51 @@ Examples of a platform might include:
 1. A cloud application platform that uses buildpacks to build source code before deployment
 
 ## Table of Contents
-
-1. [Platform API Version](#platform-api-version)
-1. [Stacks](#stacks)
-   1. [Compatibility Guarantees](#compatibility-guarantees)
-   1. [Build Image](#build-image)
-   1. [Run Image](#run-image)
-1. [Lifecycle Interface](#lifecycle-interface)
-   1. [Platform API Compatibility](#platform-api-compatibility)
-   1. [Operations](#operations)
-      1. [Build](#build)
-      1. [Rebase](#rebase)
-      1. [Launch](#launch)
-   1. [Usage](#usage)
-      1. [detector](#detector)
-      1. [analyzer](#analyzer)
-      1. [restorer](#restorer)
-      1. [builder](#builder)
-      1. [exporter](#exporter)
-      1. [creator](#creator)
-      1. [rebaser](#rebaser)
-      1. [launcher](#launcher)
-1. [Buildpacks](#buildpacks)
-   1. [Buildpacks Directory Layout](#buildpacks-directory-layout)
-1. [Security Considerations](#security-considerations)
-1. [Additional Guidance](#additional-guidance)
-   1. [Environment](#environment)
-   1. [Caching](#caching)
-1. [Data Format](#data-format)
-   1. [Files](#files)
-      1. [analyzed.toml (TOML)](#analyzedtoml-toml)
-      1. [group.toml (TOML)](#grouptoml-toml)
-      1. [metadata.toml (TOML)](#metadatatoml-toml)
-      1. [order.toml (TOML)](#ordertoml-toml)
-      1. [project-metadata.toml (TOML)](#project-metadatatoml-toml)
-      1. [stack.toml (TOML)](#group.toml-(toml))
-   1. [Labels](#labels)
-      1. [io.buildpacks.build.metadata (JSON)](#iobuildpacksbuildmetadata-json)
-      1. [io.buildpacks.lifecycle.metadata (JSON)](#iobuildpackslifecyclemetadata-json)
-      1. [io.buildpacks.project.metadata (JSON)](#iobuildpacksprojectmetadata-json)
+<!-- Using https://github.com/yzhang-gh/vscode-markdown to manage toc -->
+- [Platform Interface Specification](#platform-interface-specification)
+  - [Table of Contents](#table-of-contents)
+  - [Platform API Version](#platform-api-version)
+  - [Terminology](#terminology)
+  - [Stacks](#stacks)
+    - [Compatibility Guarantees](#compatibility-guarantees)
+    - [Build Image](#build-image)
+    - [Run Image](#run-image)
+    - [Mixins](#mixins)
+  - [Lifecycle Interface](#lifecycle-interface)
+    - [Platform API Compatibility](#platform-api-compatibility)
+    - [Operations](#operations)
+      - [Build](#build)
+      - [Rebase](#rebase)
+      - [Launch](#launch)
+    - [Usage](#usage)
+      - [`detector`](#detector)
+      - [`analyzer`](#analyzer)
+        - [Layer analysis](#layer-analysis)
+      - [`restorer`](#restorer)
+        - [Layer restoration](#layer-restoration)
+      - [`builder`](#builder)
+      - [`exporter`](#exporter)
+      - [`creator`](#creator)
+      - [`rebaser`](#rebaser)
+      - [`launcher`](#launcher)
+  - [Buildpacks](#buildpacks)
+    - [Buildpacks Directory Layout](#buildpacks-directory-layout)
+  - [Security Considerations](#security-considerations)
+  - [Additional Guidance](#additional-guidance)
+    - [Environment](#environment)
+    - [Caching](#caching)
+  - [Data Format](#data-format)
+    - [Files](#files)
+      - [`analyzed.toml` (TOML)](#analyzedtoml-toml)
+      - [`group.toml` (TOML)](#grouptoml-toml)
+      - [`metadata.toml` (TOML)](#metadatatoml-toml)
+      - [`order.toml` (TOML)](#ordertoml-toml)
+      - [`project-metadata.toml` (TOML)](#project-metadatatoml-toml)
+      - [`stack.toml` (TOML)](#stacktoml-toml)
+    - [Labels](#labels)
+      - [`io.buildpacks.build.metadata` (JSON)](#iobuildpacksbuildmetadata-json)
+      - [`io.buildpacks.lifecycle.metadata` (JSON)](#iobuildpackslifecyclemetadata-json)
+      - [`io.buildpacks.project.metadata` (JSON)](#iobuildpacksprojectmetadata-json)
 
 
 ## Platform API Version