Fix some issues with OG tags for social sharing #17
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The commit messages explain what I did here in detail but the basic idea is to print meta data for the current page instead of the same data for the whole site. This is a problem because if for example a news article is shared on FB it will display the title of the site and link to the homepage. This can be seen in the FB debugger:
I also fixed the social image by using an absolute url and I added a canonical meta tag (for SEO).
Depends on #16