doc: mark Node.js 18 as End-of-Life (#1086)

Author: richardlau

README.md

@@ -4,7 +4,6 @@
 
 | Release  | Status              | Codename     |Initial Release | Active LTS Start | Maintenance Start | End-of-life               |
 | :--:     | :---:               | :---:        | :---:          | :---:            | :---:             | :---:                     |
-| [18.x][] | **Maintenance**     | [Hydrogen][] | 2022-04-19     | 2022-10-25       | 2023-10-18        | 2025-04-30                |
 | [20.x][] | **Maintenance**     | [Iron][]     | 2023-04-18     | 2023-10-24       | 2024-10-22        | 2026-04-30                |
 | [22.x][] | **LTS**             | [Jod][]      | 2024-04-24     | 2024-10-29       | 2025-10-21        | 2027-04-30                |
 | [23.x][] | **Current**         |              | 2024-10-15     | -                | 2025-04-01        | 2025-06-01                |
@@ -59,6 +58,7 @@ that are not End-of-Life.
 | [15.x][] | **End-of-Life** |           |    2020-10-20   |         -        |                       |  2021-06-01 |
 | [16.x][] | **End-of-Life** |[Gallium][]|    2021-04-20   |    2021-10-26    |       2022-10-18      | [2023-09-11][nodejs16eol] |
 | [17.x][] | **End-of-Life** |           |    2021-10-19   |         -        |                       |  2022-06-01 |
+| [18.x][] | **End-of-Life** |[Hydrogen][]|   2022-04-19   |    2022-10-25    |       2023-10-18      |  2025-04-30 |
 | [19.x][] | **End-of-Life** |           |    2022-10-18   |         -        |                       |  2023-06-01 |
 | [21.x][] | **End-of-Life** |           |    2023-10-17   |         -        |       2024-04-01      |  2024-06-01 |