Remove Travis CI (#465)

.travis.yml

@@ -1,35 +0,0 @@
-language: rust
-
-cache:
-  cargo: true
-
-rust:
-  - stable
-  - beta
-  - nightly
-
-env:
-  global:
-    - CLIPPY_TOOLCHAIN=nightly
-
-matrix:
-  allow_failures:
-    - rust: nightly
-
-os:
-  - linux
-
-before_install:
-  - source $HOME/.nvm/nvm.sh
-  - nvm install --lts
-  - nvm use --lts
-
-before_script:
-  - if [ $TRAVIS_RUST_VERSION = $CLIPPY_TOOLCHAIN ]; then rustup component add clippy-preview --toolchain=$CLIPPY_TOOLCHAIN; fi
-
-script:
-  - cd frontend
-  - yarn
-  - yarn pretty:check
-  - yarn test
-  - yarn build

frontend/README.md

@@ -991,7 +991,7 @@ These variables will act as the defaults if the machine does not explicitly set
 Please refer to the [dotenv documentation](https://github.com/motdotla/dotenv) for more details.
 
 >Note: If you are defining environment variables for development, your CI and/or hosting platform will most likely need
-these defined as well. Consult their documentation how to do this. For example, see the documentation for [Travis CI](https://docs.travis-ci.com/user/environment-variables/) or [Heroku](https://devcenter.heroku.com/articles/config-vars).
+these defined as well. Consult their documentation how to do this. For example, see the documentation for [GitLab](https://docs.gitlab.com/ee/ci/variables/), [Travis CI](https://docs.travis-ci.com/user/environment-variables/) or [Heroku](https://devcenter.heroku.com/articles/config-vars).
 
 #### Expanding Environment Variables In `.env`