Self-serve model for funding Node.js work

@nodejs/tsc I'm sharing this concrete proposal to further address any concerns regarding https://github.com/nodejs/TSC/issues/1723#issuecomment-2827713134 before moving forward with implementation.

Problem statement

Companies and individuals want to fund Node.js work. Some Node.js maintainers are open to receiving funding for their contributions. How can we provide a self-serve way for funders to connect with those maintainers?

My proposal

Host a directory of maintainers and their areas of interest and expertise in an easily discoverable place on the Node.js website.

Add a new "Funding" item to the headers list in https://nodejs.org. It would be a link to a new page with contents:

Funding Node.js

This page outlines how you can fund the project and its maintainers.

1. Directed funding for OpenJS Foundation Member

Organizations can become OpenJS Foundation Members and use directed funding to support the project. To learn more about Project Directed Funding, visit https://openjsf.org/projects.

2. Donate via GitHub or Open Collective

The project accepts funding via:

• GitHub
• Open Collective

Funds are to be used for specific efforts as decided by the Node.js Technical Steering Committee, including:

• Security lead
• CI stability improvements
• Project health and collaboration

For more details, see Node.js Funding Sources.

3. Fund individual contributors

The following directory lists maintainers who are open to receiving funding:

(Link to a file in https://github.com/nodejs/admin which would contain this directory)

Companies and individuals may connect directly with maintainers. The Node.js project does not oversee these engagements and is not responsible for any disputes or outcomes.

Review the discussion in TSC issue 1723, the proposed nodejs.org header change, and Nodejs-Funding-Sources.md. Then inspect the nodejs/admin repository location proposed for the maintainer directory. Done means the funding page, discoverable navigation link, and directory approach are agreed and implemented.