reorganize reference page

Author: dsweber2

_pkgdown.yml

@@ -9,7 +9,7 @@ template:
 
 navbar:
   structure:
-    left:  [intro, workflows, backtesting, reference, articles, news]
+    left: [intro, workflows, backtesting, reference, articles, news]
     right: [search, github, lightswitch]
   components:
     workflows:
@@ -48,71 +48,85 @@ reference:
       - contains("forecaster")
       - contains("classifier")
 
-  - title: Forecaster modifications
+  - subtitle: Forecaster modifications
     desc: Constructors to modify forecaster arguments and utilities to produce `epi_workflow` objects
     contents:
       - contains("args_list")
       - contains("_epi_workflow")
+  ##########################
+  - title: Steps and Layers
 
-  - title: Helper functions for Hub submission
+  - subtitle: Epi recipe preprocessing steps
+    desc: >
+      Note that any `{recipes}`
+      [`step`](https://recipes.tidymodels.org/reference/index.html) is also valid
     contents:
-      - flusight_hub_formatter
+      - starts_with("step_")
 
-  - title: Parsnip engines
-    desc: Prediction methods not available elsewhere
+  - subtitle: Frosting post-processing layers
     contents:
-      - quantile_reg
-      - smooth_quantile_reg
-      - grf_quantiles
+      - starts_with("layer_")
 
-  - title: Custom panel data forecasting workflows
+  ##########################
+  - title: Epiworkflows
+  - subtitle: Basic forecasting workflow functions
     contents:
       - epi_recipe
       - epi_workflow
       - add_epi_recipe
-      - adjust_epi_recipe
-      - Add_model
-      - predict.epi_workflow
       - fit.epi_workflow
-      - augment.epi_workflow
-      - forecast.epi_workflow
-
-  - title: Epi recipe preprocessing steps
-    contents:
-      - starts_with("step_")
-      - contains("bake")
 
-  - title: Epi recipe verification checks
-    contents:
-      - check_enough_data
-
-  - title: Forecast postprocessing
-    desc: Create a series of postprocessing operations
+  - subtitle: Forecast post-processing workflow functions
+    desc: Create and apply series of post-processing operations
     contents:
       - frosting
       - ends_with("_frosting")
-      - get_test_data
       - tidy.frosting
+      - contains("slather")
 
-  - title: Frosting layers
+  - subtitle: Prediction
+    desc: Methods for prediction and modifying predictions
     contents:
-      - contains("layer")
-      - contains("slather")
+      - predict.epi_workflow
+      - augment.epi_workflow
+      - get_test_data
+      - forecast.epi_workflow
 
+  - subtitle: Modifying forecasting epiworkflows
+    desc: modify or inspect an existing recipe, workflow, or frosting
+    contents:
+      - adjust_epi_recipe
+      - Add_model
+      - add_layer
+      - layer-processors
+      - update.layer
+
+  ##########################
   - title: Automatic forecast visualization
     contents:
       - autoplot.epi_workflow
       - autoplot.canned_epipred
 
-  - title: Utilities for quantile distribution processing
+  ##########################
+  - title: Parsnip engines
+    desc: Prediction methods not available elsewhere
+    contents:
+      - quantile_reg
+      - smooth_quantile_reg
+      - grf_quantiles
+
+  ##########################
+  - title: Utilities
+    contents:
+      - flusight_hub_formatter
+      - clean_f_name
+      - check_enough_data
+
+  - subtitle: Utilities for quantile distribution processing
     contents:
       - dist_quantiles
       - contains("quantile_pred")
       - extrapolate_quantiles
       - nested_quantiles
       - weighted_interval_score
       - starts_with("pivot_quantiles")
-
-  - title: Other utilities
-    contents:
-      - clean_f_name