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scissorsneedfoodtoo and raisedadead fix(challenges): Remove duplicate Rosetta Code sorting problems (#35547)
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This PR is to remove duplicate Rosetta Code sorting problems that exist in other parts of the curriculum. Here are the problems that are being removed: 
* Sorting algorithms/Bubble sort
* Sorting algorithms/Counting sort
* Sorting algorithms/Heapsort
* Sorting algorithms/Insertion sort
* Sorting algorithms/Merge sort
* Sorting algorithms/Quicksort
* Sorting algorithms/Radix sort
* Sorting algorithms/Selection sort

This PR only removes the challenges in English. I could remove the other languages in this PR, or in another PR.

Closes #34776
Latest commit 3e51ced Mar 21, 2019
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api-server chore(tools): add user in container and fix debug of api-server Mar 15, 2019
client Correct paddings in inline code blocks (#35497) Mar 20, 2019
config
curriculum fix(challenges): Remove duplicate Rosetta Code sorting problems (#35547) Mar 21, 2019
docs fix: effective date in docs from 2018 to 2019 Mar 15, 2019
guide added when while loop is used (#34128) Mar 21, 2019
mock-guide
tools fix: Enforce lowercase usernames for profile queries Mar 6, 2019
.editorconfig
.eslintignore
.eslintrc.json fix: set a max-len rule for eslint Feb 25, 2019
.gitattributes
.gitignore
.node-inspectorrc twitter username now persisted Oct 14, 2014
.prettierrc feat: use prettier with eslint Feb 19, 2019
.snyk fix(snyk): Updated patches for vulnerabilities Jul 2, 2018
.travis.yml Fix: Current challenge timeout (#35352) Feb 22, 2019
.vcmrc feat: enforce conventional commit messages Jul 13, 2017
CODE_OF_CONDUCT.md Corrected spelling of "available" (#19978) Oct 18, 2018
CONTRIBUTING.md Add GREEK docs folder and README.md (#30597) Dec 29, 2018
Dockerfile.tests
LICENSE.md Adjusted Copyright to 2019 (#34790) Jan 2, 2019
README.french.md docs(readme): rename french readme Jan 15, 2019
README.italian.md docs(readme): rename italian readme Jan 15, 2019
README.md
change_volumes_owner.sh
docker-compose-shared.yml feat: Allows sharing of network (#16937) Mar 30, 2018
docker-compose.tests.yml chore(tools): use data volumes for node_modules Mar 15, 2019
docker-compose.yml chore(tools): use data volumes for node_modules Mar 15, 2019
lerna.json
netlify.toml fix(netlify): Reduce build time now we are publishing required packages Oct 5, 2018
package-lock.json
package.json chore(tools): use data volumes for node_modules Mar 15, 2019
sample.env

README.md

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