feat: add changes to api

docs: update readme

chore: update dependencies (#107)

fix(client): add some refactoring

fix: add small fix to comparison

fix: add minor changes to make demo usable

fix(todolist): add unsubscribe from observables

chore(deps): bump url-parse from 1.5.1 to 1.5.3 in /src/client/todolist (#55)

chore(deps): bump jszip from 3.6.0 to 3.7.1 in /src/client/todolist (#57)

chore(deps): bump postcss from 7.0.21 to 7.0.36 in /src/client/todolist (#59)

chore: add citation

chore(todolist): upgrade to ng v12

chore(deps): bump path-parse in /src/client/todo-details (#53)

chore(deps): bump handlebars in /src/client/todo-details (#38)

chore(deps): bump handlebars from 4.1.2 to 4.7.7 in /src/server (#39)