Add "data-based" command doc framework basics

docs/commands/README.md

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+# Command documentation (experimental)
+Command documentation is defined in `commands.js`. `build.js` can export a JSON file consumed by other tools (hopefully?).
+
+This documentation is loaded by the `CommandInfo` Vue component, used in `commands.md` for the command page (and maybe other places soon?).

docs/commands/build.js

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+console.log(JSON.stringify(require("./commands")));

docs/commands/commands.js

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+module.exports = {
+    "system-new": {
+        title: "Create a new system",
+        summary: "Creates a new system if you do not already have one.",
+        usage: [
+            {cmd: "system new", desc: "Creates a system with no name."},
+            {cmd: "system new `system-name`", desc: "Creates a named system."}
+        ],
+        arguments: {
+            "system-name": {type: "string", desc: "the name of the system to create", optional: true}
+        }
+    },
+    "system-info": {
+        title: "Look up info about a system",
+        summary: "Shows a system card, either your own or someone else's.",
+        usage: [
+            {cmd: "system", desc: "Looks up your own system."},
+            {cmd: "system `target`", desc: "Looks up another system."}
+        ],
+        arguments: {
+            "target": {type: "system", desc: "the system to look up"}
+        }
+    }
+};