feat: Show examples in plugin help

Adds examples to each of the plugins' config files.

Closes #25

plugins/src/calc/plugin.ron

@@ -1,6 +1,6 @@
 (
     name: "Calculator",
-    description: "Calculator with unit conversion (qalc)",
+    description: "Calculator with unit conversion (qalc): = 10 J / (196x^2) = 4 kW/s",
     query: (
         regex: "^(=)+",
         help: "= ",

plugins/src/files/plugin.ron

@@ -1,6 +1,6 @@
 (
     name: "File Navigation",
-    description: "Navigate with tab autocomplete",
+    description: "Navigate with tab autocomplete: ~/ OR /",
     query: (
         regex: "^(/|~).*",
         help: "~/",

plugins/src/find/plugin.ron

@@ -1,6 +1,6 @@
 (
     name: "Find",
-    description: "Find files in the home folder",
+    description: "Find files in the home folder: find {file}",
     query: (
         regex: "^(find )+",
         help: "find ",

plugins/src/recent/plugin.ron

@@ -1,6 +1,6 @@
 (
     name: "Recent Documents",
-    description: "Show recently-opened files",
+    description: "Show recently-opened files: recent {file}",
     query: (
         regex: "^(recent)\\s.*",
         help: "recent ",

plugins/src/terminal/plugin.ron

@@ -1,6 +1,6 @@
 (
     name: "Terminal Commands",
-    description: "Run commands in a terminal",
+    description: "Run commands in a terminal: run {cmd}",
     query: (
         regex: "^(:|t:|run ).*",
         help: "run ",

plugins/src/web/plugin.ron

@@ -1,6 +1,6 @@
 (
     name: "Web Search",
-    description: "Site-specific web search",
+    description: "Site-specific web search: ddg {keywords...}",
     query: (help: "ddg ", priority: High),
     bin: (path: "web"),
     icon: Name("system-search"),