Update READMEs and descriptions

Author: hpedrorodrigues

README.md

@@ -1,11 +1,11 @@
-# Reusable actions
+# Actions
 
 - [envsubst](./envsubst)
 - [kustomize](./kustomize)
 - [setup-sphynx](./setup-sphynx)
 
 ## Release
 
-Manually run this [workflow][release-action] with the desired version.
+Run this [workflow][release-action] with the desired version.
 
 [release-action]: https://github.com/hpedrorodrigues/actions/actions/workflows/release.yml

envsubst/action.yml

@@ -1,6 +1,6 @@
 name: envsubst
 author: Pedro Rodrigues
-description: Simple wrapper action for envsubst.
+description: Substitutes the values of environment variables using envsubst (gettext).
 inputs:
   input:
     description: One or more input files to apply substitutions to (separated by space).

kustomize/README.md

@@ -1,6 +1,6 @@
 # Kustomize
 
-Simple action to validate kustomization files and outputs using [Kustomize].
+An action to validate kustomization files and outputs using [Kustomize].
 
 ## Usage
 

kustomize/action.yml

@@ -1,6 +1,6 @@
 name: kustomize
 author: Pedro Rodrigues
-description: Simple action to validate kustomization files and outputs.
+description: Validate kustomization files and outputs.
 inputs:
   filter:
     description: Strategy to use for filtering kustomization directories.