Kindly, consider DRY, KISS and YOGNI and HTML best practices

[joffreynk]

Issues faced keeping DRY, KISS and YOGNI

• put this in function and call it when I need to save to local storage
  localStorage.setItem('todo', JSON.stringify(todo.getTodos()));
  changes applied to the following lines:

• https://github.com/JoffreyNK/To-Do-List/blob/5a654a0bae4d21e87d7a8f929ae69bc4270de154/src/index.js#L46

• https://github.com/JoffreyNK/To-Do-List/blob/5a654a0bae4d21e87d7a8f929ae69bc4270de154/src/index.js#L57

• https://github.com/JoffreyNK/To-Do-List/blob/5a654a0bae4d21e87d7a8f929ae69bc4270de154/src/index.js#L63

• https://github.com/JoffreyNK/To-Do-List/blob/5a654a0bae4d21e87d7a8f929ae69bc4270de154/src/index.js#L73

• https://github.com/JoffreyNK/To-Do-List/blob/5a654a0bae4d21e87d7a8f929ae69bc4270de154/src/index.js#L79

• repeated code that reorder the indexes of objects: please create function and wrap them their for maintenance purpose
  https://github.com/JoffreyNK/To-Do-List/blob/c90ea4103688b3ab0c1175701767ff08f41df071/src/modules/managedata.js#L40-L50

• HTML is not following HTML best practices
  https://github.com/JoffreyNK/To-Do-List/blob/c90ea4103688b3ab0c1175701767ff08f41df071/src/index.html#L10-L16

[joffreynk]

all issues fixed