chore: switch from develop/dev to main/latest image tags (#434)

Co-authored-by: Jason Woltje <[email protected]>
Co-committed-by: Jason Woltje <[email protected]>

docs/CONTRIBUTING.md

@@ -159,13 +159,12 @@ We follow a Git-based workflow with the following branch types:
 
 ### Workflow
 
-1. Always branch from `develop`
-2. Merge back to `develop` via pull request
-3. `main` is for stable releases only
+1. Always branch from `main`
+2. Merge back to `main` via pull request
 
 ```bash
 # Start a new feature
-git checkout develop
+git checkout main
 git pull --rebase
 git checkout -b feature/my-feature-name
 
@@ -269,7 +268,7 @@ Clarified pagination and filtering parameters.
 2. Create a PR via GitLab at:
    https://git.mosaicstack.dev/mosaic/stack/-/merge_requests
 
-3. Target branch: `develop`
+3. Target branch: `main`
 
 4. Fill in the PR template:
    - **Title:** `feat(#issue): Brief description` (follows commit format)