create, fmt, info: remove unused imports (#825)

Aside: with this commit, there is exactly one file (`helpers.nim`) that
imports `jsony`, and it also exports `jsony`. This makes the codebase
more robust to the problem of `parseHook`s not being visible.

src/create/approaches.nim

@@ -1,6 +1,5 @@
 import std/[os, strformat, strutils]
-import ".."/[fmt/approaches, helpers, sync/sync_common, types_track_config,
-             types_approaches_config, uuid/uuid]
+import ".."/[fmt/approaches, helpers, types_track_config, types_approaches_config, uuid/uuid]
 
 func kebabToTitleCase(slug: Slug): string =
   result = newStringOfCap(slug.len)

src/create/articles.nim

@@ -1,6 +1,5 @@
 import std/[os, strformat, strutils]
-import ".."/[fmt/articles, helpers, sync/sync_common, types_track_config,
-             types_articles_config, uuid/uuid]
+import ".."/[fmt/articles, helpers, types_track_config, types_articles_config, uuid/uuid]
 
 func kebabToTitleCase(slug: Slug): string =
   result = newStringOfCap(slug.len)

src/fmt/track_config.nim

@@ -1,4 +1,4 @@
-import std/[algorithm, sequtils, json, options, sets, strformat]
+import std/[algorithm, sequtils, json, options, sets]
 import ".."/[helpers, sync/sync_common, types_track_config]
 
 func trackConfigKeyOrderForFmt(e: TrackConfig): seq[TrackConfigKey] =

src/info/info.nim

@@ -1,5 +1,4 @@
 import std/[algorithm, os, sequtils, sets, strformat, strutils, sugar, terminal]
-import pkg/jsony
 import ".."/[cli, sync/probspecs, types_track_config]
 
 proc header(s: string): string =