build: remove unused config

Author: kanru

.github/workflows/ci.yml

@@ -3,7 +3,7 @@ on:
   pull_request:
     branches:
       - master
-      - source"
+      - source
 jobs:
   build:
     runs-on: ubuntu-latest

config.toml

@@ -4,13 +4,6 @@ base_url = "https://rust-lang.tw"
 # Whether to automatically compile all Sass files in the sass directory
 compile_sass = true
 
-# Whether to do syntax highlighting
-# Theme can be customised by setting the `highlight_theme` variable to a theme supported by Zola
-highlight_code = true
-
-# Whether to build a search index to be used later on by a JavaScript library
-build_search_index = false
-
 theme = "hallo"
 
 title = "Rust Taiwan Community"