Added a Hacks.md file with a list of instructions for uncommon issues

docs/Hacks.md

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+# Changing an already started taikai from 12 arrows to 20 arrows
+
+/!\ Works for this commit: 2023-11-21 5dfaec7, _be careful if you try it on a more recent one_!
+
+```ruby
+taikai = Taikai.find(177)
+
+taikai.update_attribute(:total_num_arrows, 20)
+taikai.participating_dojos.first.participants.each do |participant|
+ now = DateTime.now
+ participant.score.results.insert_all(
+ (4..5).map do |round_index|
+ (1..4).map do |index|
+ {
+ match_id: nil,
+ score_id: participant.score.id,
+ round: round_index,
+ index: index,
+ created_at: now,
+ updated_at: now,
+ }
+ end
+ end.flatten)
+end
+```
+
+# Reseting all users' passwords
+
+/!\ This will reset ALL passwords!!!
+
+```ruby
+User.all.each { |u| u.update(encrypted_password: User.new.send(:password_digest, 'password')) }
+```