🔨 wiki: Write article about what is dictated by the server vs the client

[zach2good]

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Describe the feature

Since it isn't an all-or-nothing situation about what is modifiable on the server, we should write down somewhere what's available for changing serverside.

Things that require client DAT edits or addons (therefore we dont support them):

• Item descriptions/tooltips
• Menu tooltips
• Event and general NPC text
• Non-custom menus
• Static entity (mob/npc) names (Index range 0-1023)
• Item/job equip flags (level/job restrictions, etc.)