Add CI Testing Section#87

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gramss wants to merge 16 commits intoros-navigation:masterfrom

gramss:CI-testing

Commits on Sep 20, 2020

small fix in rst highlighting
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Commits on Sep 21, 2020

fix the readme and build instructions to just use CI settings
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add CI Testing section to nav2-documentation incl. rewritting yaml parms
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Commits on Sep 23, 2020

tried to improve all the points mentioned above
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Commits on Sep 28, 2020

add groot intro for BT editing and monitoring
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Commits on Oct 12, 2020

Commits on Oct 14, 2020

Commits on Oct 15, 2020

add Groot to foxy migration guide
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