fix(webkeys): remove include private key from projection index (#8436)

# Which Problems Are Solved

When Web keys with a large RSA Bitsize were generated, the new web key
did not get projected.
Zitadel logs printed the following errors:

```
time="2024-08-15T09:18:47Z" level=debug msg="execution of statements failed" caller="/home/tim/Repositories/zitadel/zitadel/internal/eventstore/handler/v2/handler.go:518" error="statement failed: ID=CRDB-pKtsr Message=exec failed Parent=(ERROR: index row size 3400 exceeds btree version 4 maximum 2704 for index \"web_keys_web_key_state_idx\" (SQLSTATE 54000))" lastProcessedIndex=-1 projection=projections.web_keys
```


# How the Problems Are Solved

Remove the the `WithInclude` option with the Private key from the
`web_keys` projection index and bump the projection version.

# Additional Changes

- Correct RPC summaries for documentation
- Fix docs slug in sidebar.js

# Additional Context

- Found during release review.

proto/zitadel/resources/webkey/v3alpha/webkey_service.proto

@@ -172,8 +172,8 @@ service ZITADELWebKeys {
     };
 
     option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
-      summary: "Generate a web key pair for the instance";
-      description: "Delete a web key. Only inactive keys can be deleted. Once a key is deleted, any tokens signed by this key will be invalid."
+      summary: "Delete a web key pair for the instance";
+      description: "Delete a web key pair. Only inactive keys can be deleted. Once a key is deleted, any tokens signed by this key will be invalid."
       responses: {
         key: "200"
         value: {
@@ -198,7 +198,7 @@ service ZITADELWebKeys {
     };
 
     option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
-      summary: "Generate a web key pair for the instance";
+      summary: "List web key details for the instance";
       description: "List web key details for the instance"
       responses: {
         key: "200"