Prepare Traceability for self help guides

## Description

Prepare traceability for self help guides for the following products.
1. Registry
2. Gateway
3. Protocol Server
4. Beckn ONIX

Document the same in confluence https://fide-official.atlassian.net/wiki/spaces/TPP/pages/499810308/Self+Help+Guides+-+Traceability+Matrix

## Goals

- [ ] Ensure the following info is captured for each of the products mentioned in the description
1. User guide
2. Installation guide
3. FAQ's
4. Troubleshooting guide
5. Performance / Scalability Benchmarks's
- [ ] Document the same in confluence https://fide-official.atlassian.net/wiki/spaces/TPP/pages/499810308/Self+Help+Guides+-+Traceability+Matrix

## Expected Outcome

Document the traceability matrix in confluence, this will help us identify the gaps in documentation

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[Please note that the below section of the ticket ****has to be in the format as mentioned as it is key to enabling proper listing of the project.**** Please only choose the options mentioned under the headings wherever applicable.]

### Product Name
1. Gateway
2. Registry
3. Protocol server
4. Beckn ONIX

### Domain

NA