chore: add keywords and descriptions for Volo (cloudwego#847)

Author: GuangmingLuo

content/en/docs/volo/overview/_index.md

@@ -2,7 +2,8 @@
 title: "Overview"
 linkTitle: "Overview"
 weight: 1
-description: >
+keywords: ["RPC", "Rust", "Volo", "AFIT", "RPITIT"]
+description: "The architecture design, framework features, and related ecology of Volo."
 
 ---
 

content/en/docs/volo/volo-grpc/_index.md

@@ -2,7 +2,8 @@
 title: "Volo-gRPC"
 linkTitle: "Volo-gRPC"
 weight: 3
-description: >
+keywords: ["Volo", "gRPC", "Getting Started", "Guidelines"]
+description: "CLI tool installation, quick start and basic tutorials for Volo-gRPC."
 
 ---
 

content/en/docs/volo/volo-thrift/_index.md

@@ -2,6 +2,7 @@
 title: "Volo-Thrift"
 linkTitle: "Volo-Thrift"
 weight: 2
-description: >
+keywords: ["Volo", "Thrift", "Getting Started", "Guidelines"]
+description: "CLI tool installation, quick start and basic tutorials for Volo-Thrift."
 
 ---

content/zh/docs/volo/_index.md

@@ -2,7 +2,7 @@
 title: 'Volo'
 linkTitle: 'Volo'
 weight: 3
-Description: Volo 是字节跳动服务框架团队研发的轻量级、高性能、可扩展性强、易用性好的 Rust RPC 框架，使用了 Rust 最新的 GAT 特性。
+Description: Volo 是字节跳动服务框架团队研发的轻量级、高性能、可扩展性强、易用性好的 Rust RPC 框架，使用了 Rust 最新的 AFIT 和 RPITIT 特性。
 menu:
   main:
     weight: 3

content/zh/docs/volo/overview/_index.md

@@ -2,7 +2,8 @@
 title: "概览"
 linkTitle: "概览"
 weight: 1
-description: >
+keywords: ["RPC", "Rust", "Volo", "AFIT", "RPITIT"]
+description: "Volo 架构设计、框架特性、相关生态简介。"
 
 ---
 

content/zh/docs/volo/volo-grpc/_index.md

@@ -2,7 +2,8 @@
 title: "Volo-gRPC"
 linkTitle: "Volo-gRPC"
 weight: 3
-description: >
+keywords: ["Volo", "gRPC", "快速上手", "基础教程"]
+description: "Volo-gRPC 命令行工具安装、快速上手与基础教程。"
 
 ---
 

content/zh/docs/volo/volo-thrift/_index.md

@@ -2,6 +2,7 @@
 title: "Volo-Thrift"
 linkTitle: "Volo-Thrift"
 weight: 2
-description: >
+keywords: ["Volo", "Thrift", "快速上手", "基础教程"]
+description: "Volo-Thrift 命令行工具安装、快速上手与基础教程。"
 
 ---