feat: ensure consistent line endings across files (#1372)

* feat: ensure consistent line endings across files

adapted from https://github.com/h5bp/html5-boilerplate/blob/main/.gitattributes and https://github.com/h5bp/html5-boilerplate/blob/main/dist/.gitattributes

* refactor: configuration for markdown trailing whitespaces

Author: mfranzke

.editorconfig

@@ -9,3 +9,6 @@ end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitattributes

@@ -0,0 +1,208 @@
+# Automatically normalize line endings for all text-based files
+# https://git-scm.com/docs/gitattributes#_end_of_line_conversion
+#
+## GITATTRIBUTES FOR WEB PROJECTS
+#
+# These settings are for any web project.
+#
+# Details per file setting:
+#   text    These files should be normalized (i.e. convert CRLF to LF).
+#   binary  These files are binary and should be left untouched.
+#
+# Note that binary is a macro for -text -diff.
+######################################################################
+
+## AUTO-DETECT
+##   Handle line endings automatically for files detected as
+##   text and leave all files detected as binary untouched.
+##   This will handle all files NOT defined below.
+* text=auto
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+# For the following file types, normalize line endings to LF on
+# checkin and prevent conversion to CRLF when they are checked out
+# (this is required in order to prevent newline related issues like,
+# for example, after the build script is run)
+
+.*      text eol=lf
+*.css   text eol=lf
+*.html  text eol=lf
+*.js    text eol=lf
+*.json  text eol=lf
+*.md    text eol=lf
+*.sh    text eol=lf
+*.txt   text eol=lf
+*.xml   text eol=lf
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+## SOURCE CODE
+*.bat      text eol=crlf
+*.coffee   text
+*.htm      text
+*.inc      text
+*.ini      text
+*.jsx      text
+*.less     text
+*.od       text
+*.onlydata text
+*.php      text
+*.pl       text
+*.py       text
+*.rb       text
+*.sass     text
+*.scm      text
+*.scss     text
+*.sql      text
+*.styl     text
+*.tag      text
+*.ts       text
+*.tsx      text
+*.xhtml    text
+
+## DOCKER
+*.dockerignore text
+Dockerfile     text
+
+## DOCUMENTATION
+*.markdown   text
+*.mdwn       text
+*.mdown      text
+*.mkd        text
+*.mkdn       text
+*.mdtxt      text
+*.mdtext     text
+AUTHORS      text
+CHANGELOG    text
+CHANGES      text
+CONTRIBUTING text
+COPYING      text
+copyright    text
+*COPYRIGHT*  text
+INSTALL      text
+license      text
+LICENSE      text
+NEWS         text
+readme       text
+*README*     text
+TODO         text
+
+## TEMPLATES
+*.dot        text
+*.ejs        text
+*.haml       text
+*.handlebars text
+*.hbs        text
+*.hbt        text
+*.jade       text
+*.latte      text
+*.mustache   text
+*.njk        text
+*.phtml      text
+*.tmpl       text
+*.tpl        text
+*.twig       text
+
+## LINTERS
+.babelrc      text
+.csslintrc    text
+.eslintrc     text
+.htmlhintrc   text
+.jscsrc       text
+.jshintrc     text
+.jshintignore text
+.prettierrc   text
+.stylelintrc  text
+
+## CONFIGS
+*.bowerrc       text
+*.cnf           text
+*.conf          text
+*.config        text
+.browserslistrc text
+.editorconfig   text
+.gitattributes  text
+.gitconfig      text
+.gitignore      text
+.htaccess       text
+*.npmignore     text
+*.yaml          text
+*.yml           text
+browserslist    text
+Makefile        text
+makefile        text
+
+## HEROKU
+Procfile    text
+.slugignore text
+
+## GRAPHICS
+*.ai   binary
+*.bmp  binary
+*.eps  binary
+*.gif  binary
+*.ico  binary
+*.jng  binary
+*.jp2  binary
+*.jpg  binary
+*.jpeg binary
+*.jpx  binary
+*.jxr  binary
+*.pdf  binary
+*.png  binary
+*.psb  binary
+*.psd  binary
+*.svg  text
+*.svgz binary
+*.tif  binary
+*.tiff binary
+*.wbmp binary
+*.webp binary
+
+## AUDIO
+*.kar  binary
+*.m4a  binary
+*.mid  binary
+*.midi binary
+*.mp3  binary
+*.ogg  binary
+*.ra   binary
+
+## VIDEO
+*.3gpp binary
+*.3gp  binary
+*.as   binary
+*.asf  binary
+*.asx  binary
+*.fla  binary
+*.flv  binary
+*.m4v  binary
+*.mng  binary
+*.mov  binary
+*.mp4  binary
+*.mpeg binary
+*.mpg  binary
+*.ogv  binary
+*.swc  binary
+*.swf  binary
+*.webm binary
+
+## ARCHIVES
+*.7z  binary
+*.gz  binary
+*.jar binary
+*.rar binary
+*.tar binary
+*.zip binary
+
+## FONTS
+*.ttf   binary
+*.eot   binary
+*.otf   binary
+*.woff  binary
+*.woff2 binary
+
+## EXECUTABLES
+*.exe binary
+*.pyc binary