[Area 1 Email Security] New doc tile (#5125)

* Added overview page

* Added random folder

* Added random migration folder and header docs'

* Added pages for inline and api deployments:

* More refactoring and notes

* more updates

* Added section on enhanced detections

* Migrated over a few more docs

* More restructuring

* added allow and block lists

* Added email policy info

* Added retraction settings

* Added placeholders and PDFs for deployment pages

* Started reporting section

* Added detection search and mail trace

* added page for siem integrations

* Added how we detect phish page

* Added phish submissions page

* Added domain and routing info

* various tweaks

* Updated svg image

* Updated main description

* Made all the suggested changes (I think)

* Final changes for first round of feedback

* Added in newer versions of guides

* Fixed broken links

* Added updated pdfs and added mention to partners tile

* Added o365 bcc guide

* Apply suggestions from code review

Co-authored-by: Kate Tungusova <70746074+deadlypants1973@users.noreply.github.com>

* Update content/email-security/_index.md

Co-authored-by: Kate Tungusova <70746074+deadlypants1973@users.noreply.github.com>

* Applied other suggestions from code review

* Updated github automations

* final update

Co-authored-by: Kate Tungusova <70746074+deadlypants1973@users.noreply.github.com>