[ci skip] Shorten versioning table to VV's variant. (#353)

Markdown has a limit on how many tabs you can add to the top-side of the panel itself, therefore the README needs to be shortend to allow different versions to fit but can look confusing for others.

README.md

@@ -46,19 +46,12 @@ registry synchronization (fabric-registry-sync mod).
 
 - Client-side:
 
-|               | 1.8.9 | 1.9.x | 1.10-1.12.2 | 1.13-1.14.4 | 1.15.x | 1.16.x | 1.17.x | 1.18.x | 1.19.x | 1.20.x                                                 |
-|---------------|-------|-------|-------------|-------------|--------|--------|--------|--------|--------|--------------------------------------------------------|
-| 1.8.9 client  | ✓     | ⏪     | ⏪⟲          | ⏪⟲          | ⏪⟲     | ⏪⟲     | ⏪⟲     | ⏪⟲     | ⏪⟲     | ⏪⟲                                                     |
-| 1.12.2 client | ✓     | ✓     | ✓           | ⏪           | ⏪      | ⏪      | ⏪      | ⏪      | ⏪      | ⏪                                                      |
-| 1.14.4 client | ✓     | ✓     | ✓           | ✓           | ⟲      | ⟲      | ⟲      | ⟲      | ⟲      | ⟲                                                      |
-| 1.15.2 client | ✓     | ✓     | ✓           | ✓           | ✓      | ⟲      | ⟲      | ⟲      | ⟲      | ⟲                                                      |
-| 1.16.5 client | ✓     | ✓     | ✓           | ✓           | ✓      | ✓      | ⟲      | ⟲      | ⟲      | ⟲                                                      |
-| 1.17.1 client | ✓     | ✓     | ✓           | ✓           | ✓      | ✓      | ✓      | ⟲      | ⟲      | ⟲                                                      |
-| 1.18.2 client | ✓     | ✓     | ✓           | ✓           | ✓      | ✓      | ✓      | ✓      | ⟲      | ⟲                                                      |
-| 1.19.4 client | ✓     | ✓     | ✓           | ✓           | ✓      | ✓      | ✓      | ✓      | ✓      | ⟲                                                      |
-| 1.20.1 client | ✓     | ✓     | ✓           | ✓           | ✓      | ✓      | ✓      | ✓      | ✓      | ✓ *(⟲ if connecting to newer 1.20.2 - 1.20.6 servers)* |
-| 1.20.4 client | ✓     | ✓     | ✓           | ✓           | ✓      | ✓      | ✓      | ✓      | ✓      | ✓ *(⟲ if connecting to 1.20.6 servers)*                |
-| 1.20.6 client | ✓     | ✓     | ✓           | ✓           | ✓      | ✓      | ✓      | ✓      | ✓      | ✓                                                      |
+|               | 1.8.x | 1.9.x | 1.10-1.20.x | 1.21.x |
+|---------------|-------|-------|-------------|--------|
+| 1.8.9 client  | ✓ | ⏪ | ⏪⟲ | ⏪⟲ | ⏪⟲ | ⏪⟲ | ⏪⟲ | ⏪⟲ | ⏪⟲ | ⏪⟲ |
+| 1.12.2 client | ✓ | ✓ | ⟲ | ⟲ | ⏪ |⏪ | ⏪ | ⏪ | ⏪ | ⏪ |
+| 1.14.4-1.20.6 clients | ✓ | ✓ | ✓ | ⟲ | ⟲   ⟲ | ⟲ | ⟲ | ⟲ | ⟲ |
+| 1.21 client | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 
 ✓ = [ViaVersion](https://viaversion.com) ⟲ = [ViaBackwards](https://viaversion.com/backwards) ⏪
 = [ViaRewind](https://viaversion.com/rewind)