[Docs] Improve website with automation and documentation

[johandry]

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What this PR does / Why we need it?

• Adds automation using Travis or GH Actions (or both) to generate the website in the gh-pages branch.
• (to be decided) Pack and publish the website in a docker container
• Add documentation to the repo explaining how to add content to the website
• Report the build/release status

References

• Fixes #000

How I did it?

• The previous website had a Travis to publish the content to a stating website, there is also a script executed manually to publish the content. Both will be reused to re-program the Travis or to create a GH Actions workflow
• The

How to verify it?

• Running the scripts executed by Travis or GH Actions
• Publish a change to verify the CI/CD works

Description for the changelog

• Patterns/Solutions content from att-cloudnative/ibmcloud-pattern-guide is now in website/ to centralize code and content allowing contributions from community
• Automation to generate the website when there is a change in the content
• (To be decided) Release the website as a docker container