Added pipeline run modes (--mode) - image & coordinate, fixed schema, config, updated readme

[khersameesh24]

PR checklist

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
• If you've added a new tool - have you followed the pipeline conventions in the contribution docs- [ ] If necessary, also make a PR on the nf-core/spatialxe branch on the nf-core/test-datasets repository.
• Make sure your code lints (nf-core lint).
• Ensure the test suite passes (nextflow run . -profile test,docker --outdir <OUTDIR>).
• Usage Documentation in docs/usage.md is updated.
• Output Documentation in docs/output.md is updated.
• CHANGELOG.md is updated.
• README.md is updated (including new tool citations and authors/contributors).

[kubranarci]

Since you have more than one running mode, I think it makes sense to have more than one test for each. Also dont forget to fill docs/usage.md. One more command is, linking PRs in CHANGELOG is a good practice.