Convert the theme from freemarker to thymeleaf

[L-fw]

大致完成了首页，分类页，归档页，标签页和文章页的转换，可能还有大大小小的问题，后面会进一步改进。

[f2c-ci-robot]

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[ruibaby]

感谢参与移植，在 Review 前希望先处理这几个问题：

1. 恢复与迁移无关的文件，比如 README.md、.gitignore、package.json 等。
2. 恢复 src 目录以及构建方式，目前观察到仅提供了 templates/assets/dist 构建产物，但丢失了源文件，后续可能无法继续维护，这些构建流程与模板迁移无关。
3. 希望添加 prettier 并格式化所有模板，可以参考：https://github.com/halo-dev/theme-modern-starter

[ruibaby]

文章内容中的列表似乎没有列表样式。

[L-fw]

OK我看看