📝 update website a bit

Author: mysticatea

README.md

@@ -13,7 +13,6 @@ This package provides utility functions and classes for make ESLint custom rules
 For examples:
 
 - [getStaticValue](https://eslint-utils.mysticatea.dev/api/ast-utils.html#getstaticvalue) evaluates static value on AST.
-- [PatternMatcher](https://eslint-utils.mysticatea.dev/api/ast-utils.html#patternmatcher-class) finds a regular expression pattern as handling escape sequences.
 - [ReferenceTracker](https://eslint-utils.mysticatea.dev/api/scope-utils.html#referencetracker-class) checks the members of modules/globals as handling assignments and destructuring.
 
 ## 📖 Usage

docs/.vuepress/config.js

@@ -12,16 +12,12 @@ module.exports = {
         docsBranch: "master",
         editLinks: true,
 
-        nav: [
-            { text: "Guide", link: "/guide/getting-started" },
-            { text: "API Reference", link: "/api/ast-utils" },
-        ],
         sidebar: {
             "/": [
                 {
                     title: "Guide",
                     collapsable: false,
-                    children: ["/guide/getting-started"],
+                    children: ["/"],
                 },
                 {
                     title: "API Reference",

docs/README.md

@@ -1,22 +1,31 @@
----
-home: true
-actionText: Get Started →
-actionLink: /guide/getting-started
-features:
-- title: Scope Utilities
-  details: Finding the specific global variables and their members with tracking assignments, finding variables, etc...
-- title: AST Utilities
-  details: Computing the runtime value of a node, Getting the property name of a Property|MemberExpression|MemberExpression node, etc...
-- title: Token Utilities
-  details: Distinguishing the token types of a given token, etc...
----
-
-<center>
+# Getting Started
 
 [![npm version](https://img.shields.io/npm/v/eslint-utils.svg)](https://www.npmjs.com/package/eslint-utils)
 [![Downloads/month](https://img.shields.io/npm/dm/eslint-utils.svg)](http://www.npmtrends.com/eslint-utils)
 [![Build Status](https://travis-ci.org/mysticatea/eslint-utils.svg?branch=master)](https://travis-ci.org/mysticatea/eslint-utils)
 [![Coverage Status](https://codecov.io/gh/mysticatea/eslint-utils/branch/master/graph/badge.svg)](https://codecov.io/gh/mysticatea/eslint-utils)
 [![Dependency Status](https://david-dm.org/mysticatea/eslint-utils.svg)](https://david-dm.org/mysticatea/eslint-utils)
 
-</center>
+## 🏁 Goal
+
+`eslint-utils` package provides utility functions and classes for make ESLint custom rules.
+
+## 💿 Installation
+
+Use [npm](https://www.npmjs.com/) or a compatible tool to install.
+
+```
+npm install eslint-utils
+```
+
+::: tip Requirements
+`eslint-utils` requires Node.js `6.5.0` or newer versions.
+:::
+
+## 📖 Usage
+
+```js
+const utils = require("eslint-utils")
+
+// use it to define rules...
+```