Docs: DOC-3529 - Remove specific plan and pricing references from premium plugin partial

Replace the enumerated plan list (Community/Essential/Professional/Custom)
in the shared purchase-premium-plugins partial with a generic statement
that directs readers to the pricing page. This stops PowerPaste, and every
other premium plugin page, from naming specific plans that can go out of
date. Revert the page-level minimum plan change since the partial no longer
reads it.

Author: kemister85

modules/ROOT/pages/paste-from-word.adoc

@@ -40,6 +40,6 @@ It also does the same for images, automatically linking to the source image URL.
 liveDemo::paste-from-word[]
 
 :pluginname: PowerPaste
-:pluginminimumplan: tierthree
+:pluginminimumplan: tiertwo
 :plugindocspage: introduction-to-powerpaste.adoc
 include::partial$misc/purchase-premium-plugins.adoc[]

modules/ROOT/partials/misc/purchase-premium-plugins.adoc

@@ -8,53 +8,15 @@ ifeval::[{pluralExtensionType} != true]
 :isAre: is
 endif::[]
 
-ifeval::["{pluginminimumplan}" == "tierone"]
-:isTierOne:
-endif::[]
-ifeval::["{pluginminimumplan}" == "tiertwo"]
-:isTierTwo:
-endif::[]
-ifeval::["{pluginminimumplan}" == "tierthree"]
-:isTierThree:
-endif::[]
-ifeval::["{pluginminimumplan}" == "enterprise"]
-:isEnterprise:
-endif::[]
-
 == Getting started with {pluginname}
 
 === Creating an account
 
-Try the *{pluginname} {extensionType}* and the {cloudname} with a free link:{accountsignup}[{accountpage}]. New accounts receive a 30-day trial of the {companyname} link:{plugindirectory}[premium plugins], skins, and icon packs; with no credit card information or commitment required.
+Try the *{pluginname} {extensionType}* and the {cloudname} with a free link:{accountsignup}[{accountpage}]. New accounts receive a trial of the {companyname} link:{plugindirectory}[premium plugins], skins, and icon packs; with no credit card information or commitment required.
 
 === Get {pluginname}
 
-ifndef::isEnterprise[]
-The *{pluginname} {extensionType}* {isAre} included in the following {cloudname} plans:
-endif::[]
-ifdef::isEnterprise[]
-The *{pluginname} {extensionType}* {isAre} included in link:{pricingpage}[{enterpriseplan}].
-endif::[]
-
-ifdef::isTierOne[]
-* The link:{pricingpage}[{tieroneplan}].
-endif::[]
-ifdef::isTierOne,isTierTwo[]
-* The link:{pricingpage}[{tiertwoplan}].
-endif::[]
-ifdef::isTierOne,isTierTwo,isTierThree[]
-* The link:{pricingpage}[{tierthreeplan}].
-endif::[]
-ifndef::isEnterprise[]
-* link:{pricingpage}[{enterpriseplan}].
-endif::[]
-
-ifdef::isTierTwo[]
-A 14-day free trial is also available for the {tiertwoplan} and the {tierthreeplan}.
-endif::[]
-ifdef::isTierThree[]
-A 14-day free trial is available for the {tierthreeplan}.
-endif::[]
+The *{pluginname} {extensionType}* {isAre} available with a paid {cloudname} subscription. For the {cloudname} plans that include {pluginname}, see the link:{pricingpage}[{companyname} pricing page].
 
 == Further information
 
@@ -72,7 +34,3 @@ ifeval::["{extensionType}" != "Packs"]
 endif::[]
 
 :!isAre:
-:!isTierOne:
-:!istiertwo:
-:!istierthree:
-:!isEnterprise: