rm obsolete/unused/unmaintained CI AppVeyor and Travis scripts

.appveyor.yml

@@ -1,40 +0,0 @@
-version: '{build}'
-
-image: Visual Studio 2015
-
-cache:
-  - NimBinaries
-
-matrix:
-  # We always want 32 and 64-bit compilation
-  fast_finish: false
-
-platform:
-  - x86
-  - x64
-
-# when multiple CI builds are queued, the tested commit needs to be in the last X commits cloned with "--depth X"
-clone_depth: 10
-
-install:
-  - npm install -g ganache-cli
-  # use the newest versions documented here: https://www.appveyor.com/docs/windows-images-software/#mingw-msys-cygwin
-  - IF "%PLATFORM%" == "x86" SET PATH=C:\mingw-w64\i686-6.3.0-posix-dwarf-rt_v5-rev1\mingw32\bin;%PATH%
-  - IF "%PLATFORM%" == "x64" SET PATH=C:\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin;%PATH%
-
-  # build nim from our own branch - this to avoid the day-to-day churn and
-  # regressions of the fast-paced Nim development while maintaining the
-  # flexibility to apply patches
-  - curl -O -L -s -S https://raw.githubusercontent.com/status-im/nimbus-build-system/master/scripts/build_nim.sh
-  - env MAKE="mingw32-make -j2" ARCH_OVERRIDE=%PLATFORM% bash build_nim.sh Nim csources dist/nimble NimBinaries
-  - SET PATH=%CD%\Nim\bin;%PATH%
-
-build_script:
-  - cd C:\projects\%APPVEYOR_PROJECT_SLUG%
-  - nimble install -y
-
-test_script:
-  - ps: Start-Process ganache-cli.cmd -ArgumentList "-s 0"
-  - nimble test
-
-deploy: off

.travis.yml

@@ -1,28 +0,0 @@
-language: c
-osx_image: xcode10.2
-sudo: false
-
-# https://docs.travis-ci.com/user/caching/
-cache:
-  directories:
-    - NimBinaries
-
-git:
-  # when multiple CI builds are queued, the tested commit needs to be in the last X commits cloned with "--depth X"
-  depth: 10
-
-os:
-  - linux
-  - osx
-
-install:
-  # build nim from our own branch - this to avoid the day-to-day churn and
-  # regressions of the fast-paced Nim development while maintaining the
-  # flexibility to apply patches
-  - curl -O -L -s -S https://raw.githubusercontent.com/status-im/nimbus-build-system/master/scripts/build_nim.sh
-  - env MAKE="make -j2" bash build_nim.sh Nim csources dist/nimble NimBinaries
-  - export PATH=$PWD/Nim/bin:$PATH
-
-script:
-  - ./ci-test.sh
-