pack: initialise pack with base mods

These generally do not affect gameplay and the rest of the pack are
built upon this baseline.

mods/optigui.pw.toml

@@ -0,0 +1,13 @@
+filename = 'optigui-2.3.0-beta.8+1.21.9.jar'
+name = 'OptiGUI'
+side = 'client'
+
+[download]
+hash = '770f1b3d2e62d1a673187e9a2dc34155818ccb5bdb148ac2b7c81838a5635d4a1a92bfcd7b949fdb9d0bebd5c9f4ac5171d29848acaecbb0b0f6ade49233c098'
+hash-format = 'sha512'
+mode = 'url'
+url = 'https://cdn.modrinth.com/data/JuksLGBQ/versions/novKhTZ1/optigui-2.3.0-beta.8%2B1.21.9.jar'
+
+[update.modrinth]
+mod-id = 'JuksLGBQ'
+version = 'novKhTZ1'