finish timeline, rename lectures

.pre-commit-config.yaml

lectures/apps.py

...0015_alter_lecture_options_alter_lecture_type_and_more.py

lectures/models.py

lectures/templates/lectures/view_group_lectures.html

lectures/views.py

shared/templates/shared/includes/base.html

static_src/view_group_lectures.js

users/migrations/0008_alter_user_rsvp_lectures.py

users/models.py