Release with semantic release bot

[HonkingGoose]

We should automate creating a new release by using the Semantic Release bot, like we're doing on the Renovate bot repository already.

Todo:

• Ask for help, see discussion semantic-release/semantic-release#2466
• Create .releaserc file that holds semantic-release config
• Install exec plugin
• Configure github plugin to list directory in assets list
• Add exec plugin to config
• Drop any npm plugin
• semantic-release should create a .zip of the plain-language-guidelines folder and attach it to each release
• Start from v1.0.0 (starting from v0.0.0 is not supported by semantic-release)