feat: adapt to the comment plugin

[LIlGG]

What type of PR is this?

/kind feature

What this PR does / why we need it:

为友链页面适配评论插件。在当前的 links.html 模板下，增加如下 HTML 即可为友链页面增加评论组件。

<div th:if="${haloCommentEnabled}">
    <halo:comment
        group="plugin.halo.run"
        kind="Plugin"
        th:attr="name=${pluginName}"
    />
</div>

提交后将在评论页面展示相关信息并支持跳转至评论页面。

How to test it?

测试友链页面添加评论组件。 测试提交评论后，在评论列表是否能够显示友情链接的 subject 信息。

Which issue(s) this PR fixes:

Fixes #63

Does this PR introduce a user-facing change?

为友情链接页面适配评论插件

[f2c-ci-robot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guqing

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