incorporate reviewer advice

* omit sub-folder until solution for incoming links is found

* focus on PR instructions on details

* reflect renaming of repo

Author: Katrin Leinweber

.github/CONTRIBUTING.md renamed to CONTRIBUTING.md

@@ -3,7 +3,7 @@ Hello, and thanks for contributing to Exercism!
 In order to help your fellow volunteers, please note the following suggestions. Feel free to `[x]`-check or remove them afterwards. Use `Preview` to activate hyperlinks ;-)
 
 - [ ] Please read and apply the [Pull Request Guidelines](https://github.com/exercism/docs/blob/master/contributing-to-language-tracks/pull-request-guidelines.md).
-- [ ] Please check the [contributing guide's](https://github.com/exercism/problem-specifications/blob/master/.github/CONTRIBUTING.md#contributing) `Table of Contents` and read the relevant sections.
-- [ ] Lastly, in case this PR modifies `canonical-data.json`, please increment its version as [detailed here](https://github.com/exercism/problem-specifications#test-data-versioning). You can also find more general thoughts on exercise versioning [here](https://github.com/exercism/problem-specifications/blob/master/.github/CONTRIBUTING.md#exercise-versioning).
+- [ ] Please check the [contributing guide's](https://github.com/exercism/problem-specifications/blob/master/CONTRIBUTING.md#contributing) `Table of Contents` and read the relevant sections.
+- [ ] Lastly, in case this PR modifies `canonical-data.json`, please apply [our versioning guidelines](https://github.com/exercism/problem-specifications#test-data-versioning).
 
 You don't need to get this perfect right away. We'll help getting your pull request merged :-)

.github/PULL_REQUEST_TEMPLATE.md renamed to PULL_REQUEST_TEMPLATE.md

@@ -4,7 +4,7 @@ Shared metadata for Exercism exercises.
 
 ## Contributing Guide
 
-Please see the [contributing guide](https://github.com/exercism/x-common/blob/master/.github/CONTRIBUTING.md) and the [pull request template](https://github.com/exercism/x-common/blob/master/.github/PULL_REQUEST_TEMPLATE.md).
+Please see the [contributing guide](https://github.com/exercism/problem-specifications/blob/master/CONTRIBUTING.md) and the [pull request template](https://github.com/exercism/problem-specifications/blob/master/PULL_REQUEST_TEMPLATE.md).
 
 ## Problem metadata