doc: Initial doc for statuspage

doc/statuspage.md

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+# StatusPage
+
+This document relates to the [StatusPage](https://www.statuspage.io/) for Node.js, which can be
+found at [status.nodejs.org](https://status.nodejs.org).
+
+## Access
+
+The following people have access to the StatusPage control panel. New accounts can be added via the
+[User Management](https://manage.statuspage.io/organizations/m3074zj4qnr9/team) page.
+
+Access to StatusPage is unrestricted, so anyone in this list can make changes to the styling of
+the page, change what components are listed, see who is subscribed to notifications (PII: emails,
+phone numbers) and manage incidents on the page.
+
+The only additional "permission" is that one email address is considered the owner of the
+status page. This account cannot be removed by other members and acts as the official owner of the
+page for communication with the StatusPage folks if needed.
+
+| GitHub                                         | Email (for StatusPage access)  | Role   |
+|------------------------------------------------|--------------------------------|--------|
+| [@MattIPv4](https://github.com/MattIPv4)       | [email protected] | Owner  |
+| [@brianwarner](https://github.com/brianwarner) | [email protected]         | Member |
+
+## Twitter
+
+There is also a Twitter account, [@NodejsStatus](https://twitter.com/NodejsStatus), for the
+status page.
+
+This account is run by [@MattIPv4](https://github.com/MattIPv4) via [email protected],
+but is added to the [Twitter integration](https://manage.statuspage.io/pages/rxy2rhgm8q1n/twitter)
+on StatusPage and will automatically tweet any incidents created on the page.
+
+## Customisations
+
+The [statuspage](../statuspage) directory in this repository contains a backup of the major
+customisations applied to the Node.js status page. These should be updated whenever the
+customisations are changed on the status page.
+
+[colors.md](../statuspage/colors.md) contains the custom color set for the whole status page
+(including emails for subscribers) in
+[Your Page > Customize page and emails > Colors](https://manage.statuspage.io/pages/rxy2rhgm8q1n/design#colors-container).
+
+[styles.scss](../statuspage/styles.scss) stores the custom styling that is applied to all web pages
+of the Node.js StatusPage site. This is controlled from the
+[Customize HTML & CSS](https://manage.statuspage.io/pages/rxy2rhgm8q1n/full-customize) view
+accessed from the button top-right on
+[Your Page > Customize page and emails > Customize status page](https://manage.statuspage.io/pages/rxy2rhgm8q1n/design#design-container).
+
+[header.html](../statuspage/header.html) contains the custom HTML used for the header on the
+status page. It is important to note that this replaces the default header (logo & subscribe
+button), so using this should be avoided if possible. Like the custom styling, this is managed from
+the [Customize HTML & CSS](https://manage.statuspage.io/pages/rxy2rhgm8q1n/full-customize) page.
+
+[footer.html](../statuspage/footer.html) contains custom HTML injected into the footer of the
+status page website. This doesn't replace any default content and is a good place for custom
+scripting if needed. This is also controlled from the
+[Customize HTML & CSS](https://manage.statuspage.io/pages/rxy2rhgm8q1n/full-customize) page.