Removed how to as we have the content within HA solution description (#767)

* Removed how to as we have the content within HA solution description

* Updated links to PGSM

Author: nastena1606

docs/apt.md

@@ -88,7 +88,7 @@ Run all the commands in the following sections as root or using the `sudo` comma
           $ sudo apt install percona-patroni
           ```
 
-          [Install `pg_stat_monitor`](pg-stat-monitor.md)
+          [Install `pg_stat_monitor` :octicons-link-external-16:](https://docs.percona.com/pg-stat-monitor/install.html)
 
 
           Install `pgBouncer`:

docs/contrib.md

@@ -33,7 +33,7 @@ Find the list of controb modules and extensions included in Percona Distribution
 |[pg_freespacemap](https://www.postgresql.org/docs/{{pgversion}}/pgfreespacemap.html) |Required |Provides a means of examining the free space map (FSM), which PostgreSQL uses to track the locations of available space in tables and indexes. This can be useful for understanding space utilization and planning for maintenance operations. |
 |[pg_prewarm](https://www.postgresql.org/docs/{{pgversion}}/pgprewarm.html) | | Provides a convenient way to load relation data into either the operating system buffer cache or the PostgreSQL buffer cache. This can be useful for reducing the time needed for a newly started database to reach its full performance potential by preloading frequently accessed data.|
 |[pgrowlocks](https://www.postgresql.org/docs/{{pgversion}}/pgrowlocks.html) | Required |Provides a function to show row locking information for a specified table. |
-|[pg_stat_statements](https://www.postgresql.org/docs/{{pgversion}}/pgstatstatements.html) | Required |A module for tracking planning and execution statistics of all SQL statements executed by a server. Consider using an advanced version of `pg_stat_statements` - [`pg_stat_monitor`](pg-stat-monitor.md) |
+|[pg_stat_statements](https://www.postgresql.org/docs/{{pgversion}}/pgstatstatements.html) | Required |A module for tracking planning and execution statistics of all SQL statements executed by a server. Consider using an advanced version of `pg_stat_statements` - [`pg_stat_monitor`](https://docs.percona.com/pg-stat-monitor/index.html) |
 |[pgstattuple](https://www.postgresql.org/docs/{{pgversion}}/pgstattuple.html) | Required |Povides various functions to obtain tuple-level statistics. It offers detailed information about tables and indexes, such as the amount of free space and the number of live and dead tuples. |
 |[pg_surgery](https://www.postgresql.org/docs/{{pgversion}}/pgsurgery.html) | Required | Provides various functions to perform surgery on a damaged relation. These functions are unsafe by design and using them may corrupt (or further corrupt) your database. Use them with caution and only as a last resort|
 |[pg_trgm](https://www.postgresql.org/docs/{{pgversion}}/pgtrgm.html) | |Provides functions and operators for determining the similarity of alphanumeric text based on trigram matching. A trigram is a contiguous sequence of three characters. The extension can be used for text search and pattern matching operations. |

docs/extensions.md

@@ -5,9 +5,7 @@ Percona Distribution for PostgreSQL includes a set of extensions that have been
 The set of extensions includes the following:
 
 * [PostgreSQL contrib modules and utilities](contrib.md)
-* Extensions authored by Percona:
-  
-    * [`pg_stat_monitor`](pg-stat-monitor.md)
+* [Extensions authored by Percona](percona-ext.md)
 
 * [Third-party components](third-party.md)
 

docs/how-to.md

@@ -284,7 +284,7 @@ $ sudo yum -y install curl
         $ sudo yum install percona-patroni
         ```
 
-        [Install `pg_stat_monitor`](pg-stat-monitor.md):
+        [Install `pg_stat_monitor` :octicons-link-external-16:](https://docs.percona.com/pg-stat-monitor/install.html)
 
 
         Install `pgBouncer`:

docs/pg-stat-monitor.md

@@ -194,7 +194,6 @@ nav:
       - minor-upgrade.md
       - migration.md
   - Troubleshooting guide: troubleshooting.md
-  - How to: how-to.md
   - Uninstall: uninstalling.md
   - Release notes:
       - "Release notes index": "release-notes.md"