feat: loop level links (#1507)

* quick save

* fix: next episode

* initial for each episode

* fix formatting

* episode 12

* episode 13

* episode 14

* episode 15

* episode 12

* setup for other episodes

* disconnect levels 122 and 123

* remove unused comments

* difficulty

* formatting

* undo formatting

* add bg for loops

* iterate level links

* add hints

* level 115 description

* remove extra the

* Merge branch 'master' into loop_level_links

* update migration name