feat: add competition page

docs/competition/_category_.yml

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+label: Competition
+position: 9

docs/competition/index.md

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+# Competition
+
+The competition takes place on the Friday, and is the culmination of the teams' work.
+
+Robots play a series of league matches against each other, scoring league points as they do,
+which will then be used to determine the starting order in the knockouts. The knockouts eliminate
+teams until a winner is determined.
+
+A different set of roles is used during the competition, and this is detailed in the rota.
+
+## Matches
+
+Matches are short windows during which the game is played between robots in the arena.
+A match slot is a period of time during which a match takes place; this includes some
+time at the start (pre-game), some time at the end (post-game) and the game itself.
+The pre-game and post-game time is used for resetting the arena between matches and
+getting the next set of robots into the arena.
+
+Screens positioned around the arena provide the timings which are followed by match officials.
+It is, however, possible to delay the schedule where necessary.
+
+## Match officials
+
+A number of roles exist to ensure the efficient flow of matches. These include:
+
+-   Head Shepherd
+    -   Acts as the match ops lead
+    -   Communicates via radio with the shepherd to ensure missing teams are encouraged to attend
+    -   Stationed at the entry desk to ensure only the correct teams enter the staging area
+-   Marshal
+    -   Sees a robot through an entire match flow (staging/bading, scoring, exit)
+-   Shepherd
+    -   Operates in the team pits to remind teams of their upcoming matches
+    -   Acts as the link between volunteers in the team pits and those in/by the arena
+-   Score Entry
+    -   Transfers the contents of the paper scoresheets to the competition software
+