remove unused urls

catalog/app/constants/urls.js

@@ -1,23 +1,13 @@
 /* Constants are a developer's best friend
  * convention: camelcase, no terminating slash */
 export const blog = 'https://blog.quiltdata.com'
-export const blogManage =
-  'https://blog.quiltdata.com/its-time-to-manage-data-like-source-code-3df04cd312b8'
-export const blogYC =
-  'https://blog.ycombinator.com/data-packages-for-fast-reproducible-python-analysis/'
-export const caseStudy = 'https://quiltdata.com/docs/quants.pdf'
-export const company = 'https://company.quiltdata.com'
 export const docs = 'https://docs.quiltdata.com'
-export const git = 'https://github.com/quiltdata/quilt.git'
 export const gitWeb = 'https://github.com/quiltdata/quilt'
 export const homeMarketing = 'https://quiltdata.com'
 export const instagram = 'https://www.instagram.com/quiltdata/'
-export const installGit = 'https://git-scm.com/downloads'
-export const installQuilt = `${docs}/get-started/installation`
 export const jobs = 'https://quilt-data.breezy.hr/'
 export const linkedin = 'https://www.linkedin.com/company/quilt-data'
 export const slackInvite = 'https://slack.quiltdata.com/'
-export const pipGit = `git+${git}`
 export const icon256 = 'https://d1zvn9rasera71.cloudfront.net/q-256-square.png'
 export const tutorial =
   'https://github.com/quiltdata/quilt/blob/master/README.md#tutorial'