v0.84.0

Update custom.css @Benbentwo (#598)

what

• Bugfix code blocks with tabs

why

• Code blocks look bad inside tabs

references

• https://docs.cloudposse.com/reference-architecture/fundamentals/spacelift/#admin-stacks

Introduction to Toolset Slides @milldr (#596)

what

• Adding Introduction to Toolset slides, with integration

why

• We want to embed slides in refarch, but the Slides() function needs to be defined here with the website src

references

• JBI-134
• required by cloudposse/refarch-scaffold#369