Prepare release 0.12

[pajoma]

Milestone 1

• [x] disable codelens for now
• [x] keep codeactions for close task
• [x] implement codeaction for shift task
• [x] remove markdown-it #102
• [x] fix duplicate note links while syncing #97
• [x] check why note links are not always injected while editor is open #97
• [x] fix for placing items under correct heading
• [x] fix for #52 in release
• [x] serious refactoring to clean code base

[pajoma]

Milestone 2

• [x] add weekday in entry selection
• [ ] add telemetry
• [x] check why syncing notes from scopes does not work
• [x] check why creating a note in scope fails to read scopes correctly from configuration
• [x] add contributing.md #104
• [x] add "plan for next working day" (since "plan for tomorrow" will copy tasks to weekend days)
• [x] done in "complete task action" should include the date
• [x] handle week modifiers in input, eg. 'task week hello there'
• [x] check why "last fri" opens saturday

Deferred to next release

• [ ] trim the task list (remove empty lines), add new tasks at the end (same with notes) #77

[pajoma]

Release as v 1.0.0