docs/victoriametrics-cloud: updated pictures and descriptions with new functionality (#7014)

Improved VictoriaMetrics documentation for cloud

Related issue: https://github.com/VictoriaMetrics/cloud/issues/2143

### Describe Your Changes

Please provide a brief description of the changes you made. Be as
specific as possible to help others understand the purpose and impact of
your modifications.

### Checklist

The following checks are **mandatory**:

- [x] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).

docs/victoriametrics-cloud/quickstart.md

@@ -24,6 +24,7 @@ The document covers the following topics:
 ## Registration
 
 Start your registration process by visiting the [Sign Up](https://cloud.victoriametrics.com/signUp?utm_source=website&utm_campaign=docs_quickstart) page.
+![Signup default](quick_start_signup_default.webp)
 
 There are two different methods to create an account:
 1. Create an account via Google Auth service;
@@ -42,12 +43,12 @@ There are two different methods to create an account:
 
 ### Create an account by filling in a registration form:
 1. Fill in your email, password and password confirmation on [Sign Up page](https://cloud.victoriametrics.com/signUp?utm_source=website&utm_campaign=docs_quickstart).
-![Signup](quick_start_signup.webp)
+![Signup](quick_start_signup_fill.webp)
 
 1.All fields are required. Any errors will be shown in the interface, so it is easy to understand what should be adjusted.
    ![Signup errors](quick_start_signup_errors.webp)
 
-1. Press `Create account` button when all fields are filled in.
+1. Press `Sign Up` button when all fields are filled in.
    ![Signup create account](quick_start_signup_create_account_click.webp)
 
 You will be redirected to the main page with a notification message to confirm your email.
@@ -193,19 +194,40 @@ When you already have at least one deployment you can create a new one by clicki
 
 On the opened screen, choose parameters of your new deployment:
 
-* `Deployment type` 
+* `Deployment name` – a unique name for your deployment;
+* `Global settings` – choose between:
   * Single - for affordable, performant single-node deployments;
   * Cluster - for highly available and multi-tenant deployments;
-* `Region` – AWS region where deployment will run;
-* Desired `storage capacity` for storing metrics (you always can expand disk size later);
-* `Retention` period for stored metrics.
-* `Size` of your deployment [based on your needs](https://docs.victoriametrics.com/guides/understand-your-setup-size.html)
+  * Cloud provider - for deployments on AWS, GCP, Azure, etc.
+  * Region - cloud provider region where deployment will run;
+* `Tier and storage` – choose between:
+  * [Tier](https://docs.victoriametrics.com/victoriametrics-cloud/tiers-parameters/) – predefined set of parameters for your deployment [based on your needs](https://docs.victoriametrics.com/guides/understand-your-setup-size.html);
+  * Retention – desired retention period for stored metrics;
+  * Storage - desired storage capacity for storing metrics (you always can expand disk size later);
+  
+    We provide recommended capacity depends on how much data your ingestion rate and retention period involve, 
+    as well as on the size of each data point. We assume each data point is 0.8 byte based on our experience 
+    with VictoriaMetrics Cloud and take the ingestion rate and retention period from your deployment configuration.
+    We suggest using the recommended capacity for retention periods of one month or less. 
+    If you need to keep data longer (6 months or more), you can start with a smaller storage size and increase it over time.
+    If you ingest high cardinality data, this increases the data point size, and you may need more storage than we recommend.
+    Please note that while you can increase storage size, you cannot reduce it due to AWS limitations. 
+    We charge $0.09 per GB-month for SSD storage.
+    Since VictoriaMetrics Cloud doesn’t charge extra for storage, we recommend using enterprise features like [downsampling](https://docs.victoriametrics.com/#downsampling)
+    and [retention filters](https://docs.victoriametrics.com/#retention-filters) to optimize disk space.
+    You can find the formula for calculating the recommended storage [here](https://docs.victoriametrics.com/guides/understand-your-setup-size/#retention-perioddisk-space).  
+    Feel free to adjust parameters as needed.
+
+* `Advanced settings` – additional parameters for your deployment:
+  * `Deduplication` – defines interval when deployment leaves a single raw sample with the biggest timestamp per each discrete interval;
+  * `Maintenance Window` – when deployment should start an upgrade process if needed;
 
 Also see the [Tier Parameters and Flag Parameters Configuration](https://docs.victoriametrics.com/victoriametrics-cloud/tiers-parameters/).
 This document provides an overview of tier parameters and predefined flag settings for VictoriaMetrics Cloud.
 
 
-  ![Create deployment form](create_deployment_form.webp)
+![Create deployment continue](create_deployment_form_up.webp)
+![Create deployment continue](create_deployment_form_down.webp)
 
 
 When all parameters are configured, click on the `Create` button, and deployment will be created.