docs: Add initial build doc for LB Accordion, Grid, Ping-pong

content/en/docs/content-structure/layout-builder/_index.md

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+---
+title: Layout Builder Blocks
+---
+
+These custom block types exist to support page building with Layout Builder.
+
+## Global Fields
+
+These fields are reused across many of the below components.
+
+| Label | Machine Name | Type | Required | Cardinality | Help text | Field Settings | Notes |
+| ----- | ------------ | ---- | -------- | ----------- | --------- | -------------- | ----- |
+| Section title | field_section_title | Text (plain) | no | 1 |
+| Section subtitle | field_section_subtitle | Text (plain, long) | no | 1 |
+
+## Custom Blocks
+
+### Accordion
+
+Machine name: `lb_accordion`
+
+A component for adding custom Accordions.
+
+| Label | Machine Name | Type | Required | Cardinality | Help text | Field Settings | Notes |
+| ----- | ------------ | ---- | -------- | ----------- | --------- | -------------- | ----- |
+| Accordion Item | field_entity_reference_paragraph | Entity reference revisions | no | unlimited | | Bundle: accordion_item |
+
+#### Accordion Item
+
+Machine name: `lb_accordion_item`
+
+| Label | Machine Name | Type | Required | Cardinality | Help text | Field Settings | Notes |
+| ----- | ------------ | ---- | -------- | ----------- | --------- | -------------- | ----- |
+| Title | field_title | Text (plain) |
+| Body | field_body | Text (formatted, long, with summary) |
+
+### Grid CTA
+
+Machine name: `lb_grid_cta`
+
+Grid CTA Layout Builder component.
+
+| Label | Machine Name | Type | Required | Cardinality | Help text | Field Settings | Notes |
+| ----- | ------------ | ---- | -------- | ----------- | --------- | -------------- | ----- |
+| Section title | (inherit) |
+| Section subtitle | (inherit) |
+| Grid section CTA/link | field_grid_section_cta_link | Link | no | 1 | A link button to be displayed below the grid content |
+| # of columns | field_columns | List (text) | yes | 1 | | | Allows 2-4 columns, defaults to 4. |
+| Grid Items | field_grid_items | Entity Reference | yes | unlimited | | Bundle: Grid Item
+
+#### Grid Item
+
+Machine name: `lb_cta_item`
+
+The Grid Item paragraph is referenced by the Grid CTA.
+
+| Label | Machine Name | Type | Required | Cardinality | Help text | Field Settings | Notes |
+| ----- | ------------ | ---- | -------- | ----------- | --------- | -------------- | ----- |
+| Grid item title | field_grid_item_title | Text (plain) | no | 1 |
+| Grid item description | field_grid_item_description | Text (formatted, long) | no | 1 |
+| Grid item media | field_grid_item_icon | Entity reference | no | 1 |
+| Grid item CTA/link | field_grid_item_cta_link | Link | no | 1 |
+
+### Ping-pong
+
+| Label | Machine Name | Type | Required | Cardinality | Help text | Field Settings | Notes |
+| ----- | ------------ | ---- | -------- | ----------- | --------- | -------------- | ----- |
+| Section subtitle | field_subtitle | (inherit) |
+| Section Title | field_title | (inherit) |
+| Item title | field_item_title | Text (plain) | no | 1 |
+| Item Description | field_item_description | Text (formatted, long) | no | 1 |
+| Item CTA\Link | field_item_cta | Link | no | 2 | The first will use the primary style and the second, secondary. |
+| Item Image | field_item_image | Entity reference | no | 1 |
+| Item Image Position | field_item_image_position | List (text) | yes | 1 | Places the image on this side of the page in the full-width display. Image will always be above Description on at narrow widths.