Update README to remove unsupported architectures

Removed entries for arm32v7, i386 architectures from the table and updated the description regarding Docker manifest lists.

Author: hardillb

README.md

@@ -117,14 +117,10 @@ The following table shows the variety of provided Node-RED images.
 | **Tag**                    |**Node**| **Arch** | **Python** |**Dev**| **Base Image**             |
 |----------------------------|--------|----------|------------|-------|----------------------------|
 | 5.0.0-beta.3-24                   |   24   | amd64    |    3.x     |  yes  | amd64/node:24-alpine       |
-|                            |   24   | arm32v7  |    3.x     |  yes  | arm32v7/node:24-alpine     |
 |                            |   24   | arm64v8  |    3.x     |  yes  | arm64v8/node:24-alpine     |
-|                            |   24   | i386     |    3.x     |  yes  | i386/node:24-alpine        |
 |                            |        |          |            |       |                            |
 | 5.0.0-beta.3-24-minimal           |   24   | amd64    |     no     |  no   | amd64/node:24-alpine       |
-|                            |   24   | arm32v7  |     no     |  no   | arm32v7/node:24-alpine     |
 |                            |   24   | arm64v8  |     no     |  no   | arm64v8/node:24-alpine     |
-|                            |   24   | i386     |     no     |  no   | i386/node:24-alpine        |
 
 - All images have bash, tzdata, nano, curl, git, openssl and openssh-client pre-installed to support Node-RED's Projects feature.
 
@@ -134,8 +130,6 @@ The following table shows the provided Manifest Lists.
 
 | **Tag**                                | **Node-RED Base Image**                    |
 |----------------------------------------|--------------------------------------------|
-| latest-22, 5.0.0-beta.3-24                    | nodered/node-red:5.0.0-beta.3-24                  |
-|                                        |                                            |
 | latest-24-minimal, 5.0.0-beta.3-24-minimal    | nodered/node-red:5.0.0-beta.3-24-minimal