chore: Update docs (#166)

Author: github-actions[bot]

docs/languages.md

@@ -185,6 +185,7 @@
 | `reg` | `registry` |
 | `Rego` | `rego` |
 | `Rexx` | `rexx`, `arexx` |
+| `RPGLE` | `SQLRPGLE`, `RPG IV` |
 | `RPMSpec` | `spec` |
 | `Ruby` | `rb`, `ruby`, `duby` |
 | `Rust` | `rust`, `rs` |

docs/themes.md

@@ -1,5 +1,6 @@
 # Highlight Themes
 
+- [`RPGLE`](#RPGLE)
 - [`abap`](#abap)
 - [`algol`](#algol)
 - [`algol_nu`](#algol_nu)
@@ -68,6 +69,10 @@
 - [`xcode`](#xcode)
 - [`xcode-dark`](#xcode-dark)
 
+## `RPGLE`
+
+![RPGLE](./themes/RPGLE.svg)
+
 ## `abap`
 
 ![abap](./themes/abap.svg)