Include correct CSS file for xterm in environments page

When the xterm dependency was moved to a npm dependency
the CSS file path was not updated correctly in the environments page.

In order for xterm to render properly, it needs the correct CSS path.
94 jobs for 50956-web-terminal in 41 minutes (queued for 5 seconds)
Status Job ID Name Coverage
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manual #98314557
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review-docs-deploy-manual
 
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sast

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static-analysis

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  Post Test
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94.78%
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flaky-examples-check

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lint:javascript:report

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  Post Cleanup
manual #98314702
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review-docs-cleanup
 
Name Stage Failure
failed
danger-review Test

updated README.md

This commit message is bad because although it tells us that README.md is
updated, it doesn't tell us why or how it was updated.
Running after script...
$ date
Mon Sep 17 11:27:34 UTC 2018
ERROR: Job failed: exit code 1