Add recommendations and warnings to supported platforms page

[mattlord]

We should steer users in the direction we believe is best and caution them about ones that we know may be problematic.

This is related to: vitessio/vitess#9518

Links:

• https://deploy-preview-949--vitess.netlify.app/docs/13.0/overview/supported-databases/
• https://deploy-preview-949--vitess.netlify.app/docs/12.0/overview/supported-databases/
• https://deploy-preview-949--vitess.netlify.app/docs/11.0/overview/supported-databases/

[netlify]

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[derekperkins]

LGTM

[deepthi]

This is good.
I think it's also worth modifying this statement so that it doesn't appear to contradict the next line (which says MySQL v8 is recommended)

With MySQL 5.6 reaching end of life in February 2021, it is recommended to deploy MySQL 5.7 and later.

to

With MySQL 5.6 reaching end of life in February 2021, it is recommended to upgrade to MySQL 5.7 or later.

WDYT?

[mattlord]

This is good. I think it's also worth modifying this statement so that it doesn't appear to contradict the next line (which says MySQL v8 is recommended)

Good catch! I think that entire line becomes redundant in the older docs since we now have a note about recommended version and the 5.6 EOL. I made this new commit: 2fd9df3

[deepthi]

I think that entire line becomes redundant in the older docs since we now have a note about recommended version and the 5.6 EOL.

Where is that note? Sorry, all I'm seeing is that you deleted the line about 5.6 EOL.

[mattlord]

I think that entire line becomes redundant in the older docs since we now have a note about recommended version and the 5.6 EOL.

Where is that note? Sorry, all I'm seeing is that you deleted the line about 5.6 EOL.

The full text is now:

Vitess supports the core features of MySQL versions 5.6 to 8.0, with [some limitations](../../reference/compatibility/mysql-compatibility/). Vitess also supports [Percona Server for MySQL](https://www.percona.com/software/mysql-database/percona-server) versions 5.6 to 8.0.

 {{< info >}}For new Vitess installations, MySQL or Percona Server for MySQL version 8 are recommended.{{< /info >}}

 {{< warning >}}
 MySQL and Percona Server for MySQL 5.6 are no longer supported in Vitess 13.0 and later.
 {{< /warning >}}

We note the full version span (5.6-8.0), recommend 8.0, and warn about the 5.6 EOL.