Adding nanvault to Other Tools list (#67583)

##### SUMMARY
Adding nanvault - a standalone tool to encrypt and decrypt files in the Ansible Vault format, featuring UNIX-style composability.


##### ISSUE TYPE
- Docs Pull Request

+label: docsite_pr

docs/docsite/rst/community/other_tools_and_programs.rst

@@ -109,5 +109,6 @@ Other Tools
 - `Awesome Ansible <https://github.com/jdauphant/awesome-ansible>`_ - a collaboratively curated list of awesome Ansible resources.
 - `AWX <https://github.com/ansible/awx>`_ - provides a web-based user interface, REST API, and task engine built on top of Ansible. AWX is the upstream project for Red Hat Ansible Tower, part of the Red Hat Ansible Automation subscription.
 - `Mitogen for Ansible <https://mitogen.networkgenomics.com/ansible_detailed.html>`_ - uses the `Mitogen <https://github.com/dw/mitogen/>`_ library to execute Ansible playbooks in a more efficient way (decreases the execution time).
+- `nanvault <https://github.com/marcobellaccini/nanvault>`_ - a standalone tool to encrypt and decrypt files in the Ansible Vault format, featuring UNIX-style composability.
 - `OpsTools-ansible <https://github.com/centos-opstools/opstools-ansible>`_ - uses Ansible to configure an environment that provides the support of `OpsTools <https://wiki.centos.org/SpecialInterestGroup/OpsTools>`_, namely centralized logging and analysis, availability monitoring, and performance monitoring.
 - `TD4A <https://github.com/cidrblock/td4a>`_ - a template designer for automation. TD4A is a visual design aid for building and testing jinja2 templates. It will combine data in yaml format with a jinja2 template and render the output.