Remove numbers from the existing design proposals (#490)

Author: stasm

exploration/0000-design-proposal-template.md

@@ -0,0 +1,45 @@
+# Design Proposal Template
+
+Status: **Proposed**
+
+<details>
+	<summary>Metadata</summary>
+	<dl>
+		<dt>Contributors</dt>
+		<dd>@username</dd>
+		<dt>First proposed</dt>
+		<dd>2023-01-01</dd>
+		<dt>Pull Requests</dt>
+		<dd>#000</dd>
+	</dl>
+</details>
+
+## Objective
+
+_What is this proposal trying to achieve?_
+
+## Background
+
+_What context is helpful to understand this proposal?_
+
+## Use-Cases
+
+_What use-cases do we see? Ideally, quote concrete examples._
+
+## Requirements
+
+_What properties does the solution have to manifest to enable the use-cases above?_
+
+## Constraints
+
+_What prior decisions and existing conditions limit the possible design?_
+
+## Proposed Design
+
+_Describe the proposed solution. Consider syntax, formatting, errors, registry, tooling, interchange._
+
+## Alternatives Considered
+
+_What other solutions are available?_
+_How do they compare against the requirements?_
+_What other properties they have?_