Docs: Fix link paths

Docs/api/README.md

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+# API Documentation
+
+## Introduction
+
+This API provides CRU (Create, Read, Update) operations for various models.
+
+The API requires an API key for some operations. 
+
+The endpoints provided by this API are:
+
+## Generic:
+- / - List all routes (JSON Response)
+- /ping - Returns pong
+- /stats - Simple stats about the bot (Record counts and uptime)
+- /most-recent-drop - Returns the most recent drop (Requires API Key)
+
+## For characters:
+- [`/characters`](characters.md#get-characters)
+- [`/characters/:character_id`](characters.md#get-characterscharacter_id)
+
+## For groups:
+_TODO_
+
+## For Badges:
+_TODO_