Adjusted some features and fixed some problems.

• Adjust the file request path of css and js in the _config.yml of the theme, so that you can quickly configure their own CDN;
• Whether the new code is configurable or not, the default is a line break;
• The TOC function is activated by default, and the Front-matter configuration option for TOC is turned off for a post;
• Fixed an issue where the highlighted directory option was inaccurate when scrolling through the post;
• Remove the search box under IOS to automatically get the focus attribute, preventing the view from moving up after automatically getting the focus;