1/ Revamp of email_servers to be a introduction and allow correct redirection
+ redirection to other pages linked to mailing + ToC of email_communication folder
2/ Splitting inbound and outbound message into subfiles:
2.a/ email_servers_inbound: all documentation related to incoming emails
2.b/ email_servers_outbound: documentartion related to outgoing emails
3/ email_domain (as before) about authentication protocols to set on domains.
4/ faq: complete revamp to better match usual issues about mailings.
Also: removed unused images, adding anchors on other docs.
RST co-authored-by: jorv-odoo, jqu-odoo, xpl-odoo
doc writers:
- email_servers_inbound by qco-odoo
- email_servers_outbound by EMBR
- email_servers by abridbus
- email_domain by jqu-odoo
- faq by jorv-odoo
related documentation task-3875591
closesodoo/documentation#9935
Signed-off-by: Xavier Platteau (xpl) <xpl@odoo.com>
