added docker to technologies for civic-tech-index project

[edwlope]

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Fixes #8659

What changes did you make?

• Added Docker to technologies variable

Why did you make the changes (we will use this info to test)?

• In order to keep project information up to date
• In order for website visitors can find accurate information.

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From your project repository, check out a new branch and test the changes.

git checkout -b edwlope-update-civic-docker-8659 gh-pages
git pull https://github.com/edwlope/website.git update-civic-docker-8659