Add new feature page for - Boxcat (#89)

* Create Foo.md

* Add new feature page for - boxcat

* Remove useless junk

site/content/help/feature/boxcat/index.md

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+# Boxcat
+
+Boxcat is an open-source replacement for Nintendo's BCAT service. BCAT is a network games can leverage to add dynamic content to games. Some examples of features games make use of this for are splatoon 2 splatfests, splatoon 2 course rotations, super mario odyssey costumes, super smash bros. ultimate news, and even the news feed on the home menu. By emulating the BCAT service at a high-level, yuzu is able to intercept the game's calls to Nintendo's servers and reroute them to yuzu's servers.
+
+## Current Boxcat Events
+
+### Super Mario Odyssey
+
+The satellaview and baseball costumes are available for purchase in the shop if you haven't already bought them and the filter, tile, and kaleidoscope screenshot filters are now available.
+
+*Please remember not to spoil exact locations of hints on discord -- Leave the fun for others to discover on their own.*
+
+**Hint Art #1 -- By Jon S.**
+
+{{< imgs
+    "./hint-1-1.png|Located under the hot desert sun."
+>}}
+
+**Hint Art #2 -- By DarkLordZach**
+
+{{< imgs
+    "./hint-2-1.png|Located in the big city."
+>}}