feat(puid): add custom lookup table in config

[extouchtriangle]

This is in response to a conversation on the OTIS discord about adding a custom lookup table in rc.py.

[extouchtriangle]

yay it looks like pyright and ruff diagnostics in nvim have worked

[vEnhance]

made some changes:

• I think lookup doesn't feel right for the name on a config file, so I changed it to abbreviations which is more intuitive. lookup is the internal variable name, imo
• used config.get('lookup', {}) which is shorter (one line rather than four)
• I think in the example we shouldn't use python dictionary format, imo the point of YAML is to be human readable. the following is arguably easier to read:

abbreviations:
  Inter Galaxy Math Olympiad: IGMO
  Inter Universe Math Olympiad: IUMO

Overall diff:

diff --git a/von/rc.py b/von/rc.py
index c6708c5..4c3560b 100644
--- a/von/rc.py
+++ b/von/rc.py
@@ -51,12 +51,12 @@ tags: ["trivial", "easy", "medium", "hard", "brutal"]
 # By default, it detects from $EDITOR automatically
 # editor: vim
 
-# If you would like to define a custom contest name
-# (to be used in the PUID script), then you should
-# define it here. This will also override any "standard"
-# lookups in `puid.py`. (This should be in python dictionary
-# format)
-# lookup: {"contest-1": "abbreviation-1", "contest-2": "abbreviation-2"}
+# If you would like to define a custom contest name (to be used in the PUID script),
+# then you should define it here.
+# This will also override any "standard" lookups in `puid.py`.
+# abbreviations:
+#   Inter Galaxy Math Olympiad: IGMO
+#   Inter Universe Math Olympiad: IUMO
 """
 
 if not CONFIG_DIR.exists():
@@ -120,10 +120,7 @@ elif sys.platform.startswith("darwin"):
 else:
     USER_OS = "linux"  # including cygwin
 
-if (custom_lookup := config.get("lookup")) is not None:
-    VON_CUSTOM_LOOKUP = custom_lookup
-else:
-    VON_CUSTOM_LOOKUP = {}
+VON_CUSTOM_LOOKUP = config.get("abbreviations", {})
 
 # These used to be editable but I don't think it's worth it
 VON_INDEX_NAME = "index"

let me know if that looks OK then we can merge this

[extouchtriangle]

Yeah, this looks good.