Remove old files.

.github/.mergify.yml

@@ -1,7 +0,0 @@
-pull_request_rules:
-  - name: PR on main is never approved.
-    conditions:
-      - base=main
-    actions:
-      close:
-        message: Please reopen this PR on the `develop` branch. Thank you.

.scrutinizer.yml

@@ -1,58 +0,0 @@
---- 
-build: 
-  nodes: 
-    analysis: 
-      project_setup: 
-        override: true
-      tests: 
-        override: 
-          - php-scrutinizer-run
-checks: 
-  javascript: true
-  php: 
-    align_assignments: true
-    avoid_fixme_comments: true
-    avoid_multiple_statements_on_same_line: true
-    avoid_perl_style_comments: true
-    avoid_todo_comments: true
-    duplication: false
-    encourage_single_quotes: true
-    newline_at_end_of_file: true
-    no_goto: true
-    no_long_variable_names: 
-      maximum: "20"
-    no_short_method_names: 
-      minimum: "3"
-    no_short_variable_names: 
-      minimum: "3"
-    optional_parameters_at_the_end: true
-    parameter_doc_comments: true
-    remove_extra_empty_lines: true
-    return_doc_comment_if_not_inferrable: true
-    return_doc_comments: true
-    uppercase_constants: true
-    use_self_instead_of_fqcn: true
-coding_style: 
-  php: 
-    spaces: 
-      around_operators: 
-        concatenation: true
-      other: 
-        after_type_cast: false
-filter: 
-  excluded_paths: 
-    - database/migrations/*
-    - bootstrap/*
-    - config/*
-    - docker/*
-    - public/js/lib/*
-    - public/lib/adminlte/js/*
-    - public/lib/bootstrap/js/*
-    - resources/*
-    - routes/*
-    - storage/*
-  paths: 
-    - app/*
-    - public/js/ff/*
-tools: 
-  external_code_coverage: false

.travis.yml

@@ -1,20 +0,0 @@
-language: php
-php:
-- '7.4'
-dist: xenial
-os: linux
-cache:
-  directories:
-  - "/home/travis/.config"
-  - "/home/travis/build/firefly-iii/firefly-iii/vendor"
-
-branches:
-  only:
-  - develop
-
-before_script:
-- phpenv config-rm xdebug.ini || return 0
-
-script:
-- "./.ci/phpstan.sh"
-- "./.ci/phpunit.sh"