Upgraded Dart version, better Dockerfile and renamed project

Dart is now upgraded to version 2.8

Any change in dependencies or Dart tooling won’t trigger Docker to
reinstall anything Ruby-related in the image afterward

Name of the Dart package and its homepage were changed, forgot to do
that

Dockerfile

@@ -1,7 +1,11 @@
-FROM google/dart:2.7
+FROM google/dart:2.8
 
 WORKDIR /app
 
+# Get Ruby Sass
+RUN apt update && apt install ruby-sass ruby-dev build-essential -y
+RUN gem install sass-listen
+
 # Get Dart dependencies
 RUN mkdir -p /pub-cache
 ENV PUB_CACHE=/pub-cache
@@ -11,10 +15,8 @@ ADD pubspec.* /app/
 RUN pub get
 RUN pub get --offline
 
-# Get Ruby Sass
-RUN apt update && apt install ruby-sass ruby-dev build-essential -y
-RUN gem install sass-listen
-
-ADD . /app/
+# ADD . /app/
+ADD web /app/
+ADD start.sh /app/
 
 CMD ["./start.sh"]