A big change for template paths landed in Hugo 0.146.0.
In `layouts`, we:
- remove `_default` and move everything in it directly under `layouts`
- rename `partials` and `shortcodes` to `_partials` and `_shortcodes`
- adapt to Hugo and docsy changes about the render-heading hook.
We don't need a copy of the heading self-link template now that it is
defined as a partial.
- update `docs/baseof.html` to match a change upstream
- split `docs/changelog.html` because it doesn't work for the section
page anymore. We create a `changelog-index` layout for this.
Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>
Replace the current stack of hugo templates with a towncrier invocation. The main advantage of this is that it means that the "Changes since last release" section is consistent with the changelogs for the actual releases.
This also changes the release process so that the changelog is generated before tagging, which means that the thing tagged v1.5 is actually the v1.5 spec.
Fixes#908.