[BB-628] Make small corrections to EdX Docs.

Description

This PR updates some old information on the documentation.
This covers:

  • Updating installation instructions for XBlocks on the Docker Devstack

  • Removing references of the color bar for indicating status on sections (the color bars are now only on the subsections)

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      1. Reviewers

  • [ ] @viadanna

  • [ ] Doc team review (sanity check, copy edit, or dev edit?): @edx/doc

  • [ ] EdX Expert TBD

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      1. Testing

  • [x] Ran ./run_tests.sh without warnings or errors

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      1. Post-review

  • [ ] Add a comment with the description of this change or link this PR to the next release notes task.

  • [ ] Squash commits

Assignee

Grant Goodman

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Giovanni Cimolin da Silva

Repo

edx/edx-documentation

Customer

Epic Link

None

OSCM Assignee

None

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Platform Map Area (Levels 3 & 4)

None

Priority

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