Fix several broken links
Fix several (most) broken links. Remaining broken links:
INFO - Doc file 'products/foundations/cicd/infra_pipelines.md' contains an unrecognized relative link './gitlab/#merge-request', it was left as is. Did you mean
'gitlab/README.md#merge-request'?
INFO - Doc file 'products/foundations/cicd/tower/cloud-factory-requests.md' contains an unrecognized relative link 'portfolio-doc-placeholder', it was left as is.
INFO - Doc file 'products/foundations/network/proxy/cloud-factory-requests.md' contains an unrecognized relative link 'portfolio-doc-placeholder', it was left as is.
INFO - Doc file 'products/foundations/network/proxy/faq.md' contains an unrecognized relative link '../connect', it was left as is. Did you mean 'connect.md'?