Add hooks

[razonyang]

Hooks provide a way to add code on a page. For example(search engine webmaster verification: Google, Bing, Baidu etc):

<meta name="google-site-verification" content="xxx" />

This way is more flexible than define a parameter for each search engines.

[onweru]

Interesting idea. It does, however, introduce the same problem described by @rootwork in #28.

[razonyang]

I don't think there will be such a problem. I create my own hooks in layouts/partials/hooks/*(not themes/hugo-clarity/layouts/partials/hooks/*), so the theme can be a git submodule, and we can also track modifications, because we create and override these files not modify them.

Partial Template Lookup Order

[onweru]

Fair enough, could you add comments on the hook files placeholders e.g layouts/partials/hooks/body-end.html, indicating that the contents of those files should only be overridden (i.e never edited directly)?

[razonyang]

I documented this in README.md.