Split and Organise documentation files (#404)

* Set global TOC collapse to false

* Split documentation

I tried to split the index.md file into logical parts, not changing the contents.
I did add a space and change one HTTP URL to HTTPS.

---------

Co-authored-by: Sean Whalen <44679+seanthegeek@users.noreply.github.com>

docs/source/davmail.md

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+
+### Accessing an inbox using OWA/EWS
+
+:::{note}
+Starting in 8.0.0, parsedmarc supports accessing Microsoft/Office 365
+inboxes via the Microsoft Graph API, which is preferred over Davmail.
+:::
+
+Some organizations do not allow IMAP or the Microsoft Graph API,
+and only support Exchange Web Services (EWS)/Outlook Web Access (OWA).
+In that case, Davmail will need to be set up
+as a local EWS/OWA IMAP gateway. It can even work where
+[Modern Auth/multi-factor authentication] is required.
+
+To do this, download the latest `davmail-version.zip` from
+<https://sourceforge.net/projects/davmail/files/>
+
+Extract the zip using the `unzip` command.
+
+Install Java:
+
+```bash
+sudo apt-get install default-jre-headless
+```
+
+Configure Davmail by creating a `davmail.properties` file
+
+```properties
+# DavMail settings, see http://davmail.sourceforge.net/ for documentation
+
+#############################################################
+# Basic settings
+
+# Server or workstation mode
+davmail.server=true
+
+# connection mode auto, EWS or WebDav
+davmail.enableEws=auto
+
+# base Exchange OWA or EWS url
+davmail.url=https://outlook.office365.com/EWS/Exchange.asmx
+
+# Listener ports
+davmail.imapPort=1143
+
+#############################################################
+# Network settings
+
+# Network proxy settings
+davmail.enableProxy=false
+davmail.useSystemProxies=false
+davmail.proxyHost=
+davmail.proxyPort=
+davmail.proxyUser=
+davmail.proxyPassword=
+
+# proxy exclude list
+davmail.noProxyFor=
+
+# block remote connection to DavMail
+davmail.allowRemote=false
+
+# bind server sockets to the loopback address
+davmail.bindAddress=127.0.0.1
+
+# disable SSL for specified listeners
+davmail.ssl.nosecureimap=true
+
+# Send keepalive character during large folder and messages download
+davmail.enableKeepalive=true
+
+# Message count limit on folder retrieval
+davmail.folderSizeLimit=0
+
+#############################################################
+# IMAP settings
+
+# Delete messages immediately on IMAP STORE \Deleted flag
+davmail.imapAutoExpunge=true
+
+# Enable IDLE support, set polling delay in minutes
+davmail.imapIdleDelay=1
+
+# Always reply to IMAP RFC822.SIZE requests with Exchange approximate
+# message size for performance reasons
+davmail.imapAlwaysApproxMsgSize=true
+
+# Client connection timeout in seconds - default 300, 0 to disable
+davmail.clientSoTimeout=0
+
+#############################################################
+```
+
+#### Running DavMail as a systemd service
+
+Use systemd to run `davmail` as a service.
+
+Create a system user
+
+```bash
+sudo useradd davmail -r -s /bin/false
+```
+
+Protect the `davmail` configuration file from prying eyes
+
+```bash
+sudo chown root:davmail /opt/davmail/davmail.properties
+sudo chmod u=rw,g=r,o= /opt/davmail/davmail.properties
+```
+
+Create the service configuration file
+
+```bash
+sudo nano /etc/systemd/system/davmail.service
+```
+
+```ini
+[Unit]
+Description=DavMail gateway service
+Documentation=https://sourceforge.net/projects/davmail/
+Wants=network-online.target
+After=syslog.target network.target
+
+[Service]
+ExecStart=/opt/davmail/davmail /opt/davmail/davmail.properties
+User=davmail
+Group=davmail
+Restart=always
+RestartSec=5m
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Then, enable the service
+
+```bash
+sudo systemctl daemon-reload
+sudo systemctl enable parsedmarc.service
+sudo service davmail restart
+```
+
+:::{note}
+You must also run the above commands whenever you edit
+`davmail.service`.
+:::
+
+:::{warning}
+Always restart the service every time you upgrade to a new version of
+`davmail`:
+
+```bash
+sudo service davmail restart
+```
+
+:::
+
+To check the status of the service, run:
+
+```bash
+service davmail status
+```
+
+:::{note}
+In the event of a crash, systemd will restart the service after 5
+minutes, but the `service davmail status` command will only show the
+logs for the current process. To vew the logs for previous runs as
+well as the current process (newest to oldest), run:
+
+```bash
+journalctl -u davmail.service -r
+```
+
+:::
+
+#### Configuring parsedmarc for DavMail
+
+Because you are interacting with DavMail server over the loopback
+(i.e. `127.0.0.1`), add the following options to `parsedmarc.ini`
+config file:
+
+```ini
+[imap]
+host=127.0.0.1
+port=1143
+ssl=False
+watch=True
+```
+
+[modern auth/multi-factor authentication]: https://davmail.sourceforge.net/faq.html