This fix works by adding missing two missing `.extra`'s when accessing the `logo_home_link` in the `header` template block.
The bug is caused by the first missing `.extra`, which makes Tera assume that `logo_home_link` variable doesn't exist, so the `if` trigger for using it never fires. This means that the logo will always link to the default value of `base_url`.
The second missing `.extra` comes after the `if` fires. It's used to set the value of `logo_link` to `logo_home_link`.
* Noting that (as of 0.14) zola does not pass much of a context when
rendering the 404 page, so things like current URL/path aren't
available
* To work around this the `menu` macro has been split into `menu_for`
which accepts a parameter for which item is active.
* The previous macro continues to work as is, forwarding the results of
figuring out which item is active to the new `menu_for` macro
* The added 404 page will then use the `menu_for` macro and pass in a
blank item
