chore: organize diagrams in different folders

docs/_diagrams/README.md

@@ -5,7 +5,7 @@ The ER diagrams were created with https://github.com/BurntSushi/erd/.
 You can go download erd from https://github.com/BurntSushi/erd/releases and then do:
 
 ```bash
-./erd_static-x86-64 -i film.er -o ../_static/film.png
+./erd_static-x86-64 -i ./er/film.er -o ../_static/film.png
 ```
 
 The fonts used belong to the GNU FreeFont family. You can download them here: http://ftp.gnu.org/gnu/freefont/
@@ -44,9 +44,9 @@ The UML diagrams are created with https://plantuml.com/.
 
 PlantUML only creates one diagram per file.
 That's why we need to create another one for dark mode.
-For example, for the file [arch.uml](./arch.uml) there's [arch-dark](./arch-dark.uml) which includes the first one:
+For example, for the file [uml/arch.uml](uml/arch.uml) there's [uml/dark/arch-dark.uml](uml/dark/arch-dark.uml) which includes the first one:
 
 ```bash
-plantuml -tsvg arch.uml -o ../_static
-plantuml -tsvg -darkmode arch-dark.uml -o ../_static
+plantuml -tsvg uml/arch.uml -o ../../_static
+plantuml -tsvg -darkmode uml/dark/arch-dark.uml -o ../../../_static
 ```

docs/_diagrams/arch-dark.uml

@@ -1,3 +0,0 @@
-@startuml
-!include arch.uml
-@enduml

docs/_diagrams/uml/dark/arch-dark.uml

@@ -0,0 +1,3 @@
+@startuml
+!include ../arch.uml
+@enduml

nix/tools/docs.nix

@@ -90,8 +90,8 @@ let
         ${pdflatex}/bin/pdflatex -halt-on-error -output-directory="$tmpdir" db.tex
         ${imagemagick}/bin/convert -density 300 "$tmpdir/db.pdf" ../_static/db.png
 
-        ${plantuml}/bin/plantuml -tsvg arch.uml -o ../_static
-        ${plantuml}/bin/plantuml -tsvg -darkmode arch-dark.uml -o ../_static
+        ${plantuml}/bin/plantuml -tsvg uml/*.uml -o ../../_static
+        ${plantuml}/bin/plantuml -tsvg -darkmode uml/dark/*.uml -o ../../../_static
       '';
 
   server =