feat: support obtaining the configuration of halo.external-url for themes and plugins #2714
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What type of PR is this?
/kind improvement
/area core
/milestone 2.0
What this PR does / why we need it:
主题和插件支持获取
halo.external-url
配置信息Which issue(s) this PR fixes:
Fixes #2711
Special notes for your reviewer:
how to test it?
<p th:text="${site.url}"></p>
可以正确显示/cc @halo-dev/sig-halo
Does this PR introduce a user-facing change?