Changed arch linux from h2 to h3

I updated the install instructions (snap, scoop, chocolatey) and added the ones where Gutenberg already got renamed to Zola also to the top of the document.

Should yaourt be replaced by one of the other aur-helpers (pikaur, yay,...) as the development for it is stalled/discontinued for quite some time now although it is still working?

Scoop: https://github.com/lukesampson/scoop/blob/master/bucket/zola.json
Chocolatey: https://chocolatey.org/packages/zola
Snap: https://snapcraft.io/zola

Fix typo (missing 's')

Fix snapcraft build

Add missing pkg-config for finding openssl to snapcraft.yaml

Spells breadcrumbs correctly

0.5.0

Add info about chocolatey package

Closes #385

To override all child pages

Closes #397
Tests from PR #434

Closes #413
Closes #408

add watch command

Add links to tera documentation for filters and functions

Fixes https://github.com/Keats/gutenberg/issues/510. Well, should help with it.