gem templates sub folder reorganization with installation instructions updated

CURRENT-V2/gems-and-gpts/templates/epicN.txt

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+# Epic {N}: {Epic Title}
+
+**Goal:** {State the overall goal this epic aims to achieve, linking back to the PRD goals.}
+
+## Story List
+
+{List all stories within this epic. Repeat the structure below for each story.}
+
+### Story {N}.{M}: {Story Title}
+
+- **User Story / Goal:** {Describe the story goal, ideally in "As a [role], I want [action], so that [benefit]" format, or clearly state the technical goal.}
+- **Detailed Requirements:**
+  - {Bulleted list explaining the specific functionalities, behaviors, or tasks required for this story.}
+  - {Reference other documents for context if needed, e.g., "Handle data according to `docs/data-models.md#EntityName`".}
+  - {Include any technical constraints or details identified during refinement - added by Architect/PM/Tech SM.}
+- **Acceptance Criteria (ACs):**
+  - AC1: {Specific, verifiable condition that must be met.}
+  - AC2: {Another verifiable condition.}
+  - ACN: {...}
+- **Tasks (Optional Initial Breakdown):**
+  - [ ] {High-level task 1}
+  - [ ] {High-level task 2}
+
+---
+
+### Story {N}.{M+1}: {Story Title}
+
+- **User Story / Goal:** {...}
+- **Detailed Requirements:**
+  - {...}
+- **Acceptance Criteria (ACs):**
+  - AC1: {...}
+  - AC2: {...}
+- **Tasks (Optional Initial Breakdown):**
+  - [ ] {...}
+
+---
+
+{... Add more stories ...}
+
+## Change Log
+
+| Change        | Date       | Version | Description                    | Author         |
+| ------------- | ---------- | ------- | ------------------------------ | -------------- |