chore: organize diagrams in different folders

docs/_diagrams/er/boxoffice.er

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+entity {font: "FreeSans"}
+relationship {font: "FreeMono"}
+
+[Box_Office]
+*bo_date
+*+film_id
+gross_revenue
+
+[Films]
+*id
++director_id
+title
+`...`
+
+Box_Office +--1 Films

docs/_diagrams/er/employees.er

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+# Build using: -e ortho
+
+entity {font: "FreeSans"}
+relationship {font: "FreeMono"}
+
+[Employees]
+*id
+first_name
+last_name
++supervisor_id
+
+Employees 1--* Employees

docs/_diagrams/er/film.er

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+entity {font: "FreeSans"}
+relationship {font: "FreeSerif"}
+
+[Films]
+*id
++director_id
+title
+year
+rating
+language
+
+[Directors]
+*id
+first_name
+last_name
+
+[Actors]
+*id
+first_name
+last_name
+
+[Roles]
+*+film_id
+*+actor_id
+character
+
+[Competitions]
+*id
+name
+year
+
+[Nominations]
+*+competition_id
+*+film_id
+rank
+
+[Technical_Specs]
+*+film_id
+runtime
+camera
+sound
+
+Roles *--1 Actors
+Roles *--1 Films
+
+Nominations *--1 Competitions
+Nominations *--1 Films
+
+Films *--1 Directors
+
+Films 1--1 Technical_Specs

docs/_diagrams/er/orders.er

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+# Build using: -e ortho
+
+entity {font: "FreeSans"}
+relationship {font: "FreeMono"}
+
+[Addresses]
+*id
+name
+city
+state
+postal_code
+
+[Orders]
+*id
+name
++billing_address_id
++shipping_address_id
+
+Orders *--1 Addresses
+Orders *--1 Addresses

docs/_diagrams/er/premieres.er

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+entity {font: "FreeSans"}
+relationship {font: "FreeMono"}
+
+[Premieres]
+*id
+location
+date
++film_id
+
+[Films]
+*id
++director_id
+title
+`...`
+
+Premieres *--1 Films

docs/_diagrams/er/presidents.er

@@ -0,0 +1,12 @@
+# Build using: -e ortho
+
+entity {font: "FreeSans"}
+relationship {font: "FreeMono"}
+
+[Presidents]
+*id
+first_name
+last_name
++predecessor_id
+
+Presidents 1--? Presidents

docs/_diagrams/er/users.er

@@ -0,0 +1,18 @@
+# Build using: -e ortho
+
+entity {font: "FreeSans"}
+relationship {font: "FreeMono"}
+
+[Users]
+*id
+first_name
+last_name
+username
+
+[Subscriptions]
+*+subscriber_id
+*+subscribed_id
+type
+
+Users 1--* Subscriptions
+Subscriptions *--1 Users