website: fix broken links (#3861)

Refs: https://app.intercom.com/a/apps/qiqpfgjg/inbox/inbox/5079389/conversations/26852700008229

.github/CONTRIBUTING.md

@@ -40,7 +40,7 @@ yarn run test:unit
 
 ### End-to-End tests
 
-We use [Cypress](cypress.io/) for our e2e test suite. Be sure to checkout “[Writing your first test](https://docs.cypress.io/guides/getting-started/writing-your-first-test#Add-a-test-file)” and the “[Introduction to Cypress](https://docs.cypress.io/guides/core-concepts/introduction-to-cypress#Cypress-Can-Be-Simple-Sometimes)”. You should also be aware of the “[Best Practices](https://docs.cypress.io/guides/references/best-practices)”.
+We use [Cypress](https://www.cypress.io/) for our e2e test suite. Be sure to checkout “[Writing your first test](https://docs.cypress.io/guides/getting-started/writing-your-first-test#Add-a-test-file)” and the “[Introduction to Cypress](https://docs.cypress.io/guides/core-concepts/introduction-to-cypress#Cypress-Can-Be-Simple-Sometimes)”. You should also be aware of the “[Best Practices](https://docs.cypress.io/guides/references/best-practices)”.
 
 To get started make sure you have your `.env` set up. Copy the contents of `.env.example` to a file named `.env` and add the values relevant for the test(s) you are trying to run.
 

website/src/_posts/2019-04-liftoff-11.md

@@ -37,7 +37,7 @@ And another week bites the dust! With the weekend right around the corner, we're
 
 - We released a new version of Uppy. While it isn’t 1.0 just quite yet, this is another step in the right direction. Uppy `0.30.4` features fixes for `allowSyntheticImports`, Typescript typings, issues when using Companion Client for remote AWS-S3 uploads, and using websockets and console.dir in React Native.
 
-- Artur and [Renée](https://github.com/goto-bus-stop) reviewed and merged a [PR](https://github.com/transloadit/uppy/pull/1360) that allows a user to customize the status of an upload in Uppy. Thanks to [Mactavish](https://github.com/Mactaivsh) for contributing!
+- Artur and [Renée](https://github.com/goto-bus-stop) reviewed and merged a [PR](https://github.com/transloadit/uppy/pull/1360) that allows a user to customize the status of an upload in Uppy. Thanks to Mactavish for contributing!
 
 - [Abdel](https://github.com/kiloreux) [fixed the Serverless example](https://github.com/transloadit/uppy/pull/1408) for running Companion on AWS Lambda.
 

website/src/_posts/2019-04-liftoff-14.md

@@ -31,7 +31,7 @@ While there are still things to be implemented, such as picking files from Insta
 
 ## In Progress
 
-- [Alex](https://github.com/nqst) is working on improving the Uppy design (in the code) in his [`design-facelift` branch](https://github.com/transloadit/uppy/compare/master...nqst:design-facelift).
+- [Alex](https://github.com/nqst) is working on improving the Uppy design (in the code) in his `design-facelift` branch
 
 - [Evgenia](https://github.com/lakesare) is working on improving accessibility together with Alex, who found many issues that we still need to fix in this area.
 

website/src/_posts/2019-04-liftoff-16.md

@@ -32,7 +32,7 @@ Big shout out to both!
     - [Ife](https://github.com/ifedapoolarewaju) will be integrating fingerprinting and hash code support [into tus-js-client](https://github.com/tus/tus-js-client/pull/73).
     - If the team has the time, they will also look into large file support, upload and download reporting for Companion XHR uploads, and an issue concerning XHR uploads with the [Transloadit API](https://transloadit.com/docs/api/).
 
-- [Alex](https://github.com/nqst) continues [improving Uppy's UI](https://github.com/transloadit/uppy/compare/master...nqst:design-facelift) and has recently been refactoring CSS code, while Evgenia keeps charging at the [many accessibility issues](https://github.com/transloadit/uppy/issues/created_by/nqst) that are still open.
+- [Alex](https://github.com/nqst) continues improving Uppy's UI and has recently been refactoring CSS code, while Evgenia keeps charging at the [many accessibility issues](https://github.com/transloadit/uppy/issues/created_by/nqst) that are still open.
 
 In addition to getting Uppy 1.0 out of the dog house, I mentioned that the team is already talking about features and fixes to tackle after 1.0. If you look at our [CHANGELOG](https://github.com/transloadit/uppy/blob/master/CHANGELOG.md), you'll notice some 1.1 todos in there. There's always room for improvement, so now you have something to look forward to after Uppy 1.0 hits the web! :wink:
 

website/src/_posts/2019-04-liftoff-17.md

@@ -33,7 +33,7 @@ After:<br />
 
 - Artur is reviewing PRs, reporting errors and testing Uppy in response to the team’s feedback. 
 
-- Alex continues [improving Uppy's UI](https://github.com/transloadit/uppy/compare/master...nqst:design-facelift) and has recently been refactoring CSS code, while [Evgenia](https://github.com/lakesare) keeps charging at the [many accessibility issues](https://github.com/transloadit/uppy/issues/created_by/nqst) that are still open.
+- Alex continues improving Uppy's UI and has recently been refactoring CSS code, while [Evgenia](https://github.com/lakesare) keeps charging at the [many accessibility issues](https://github.com/transloadit/uppy/issues/created_by/nqst) that are still open.
 
 - Evgenia is also working on the new drag/drop implementation, which will include a new _Drop Here_ placeholder and not experience any flickering. And as if that weren't enough, she is having a go at `drop folder` support for cross-browser compatibility as well, so that it won’t be relying on DOM manipulation in our Preact components.