Update FlexConfirmMail for Outlook 2 (#8)

* Create service.rst

Service explanation page

* Delete source/howto.rst

Delete old pages

* Update index.rst

adjust top page

* Create feature.rst

add new feature page

* Update index.rst

add YouTube Link

* Update index.rst

* Delete source/_static/ConfigDialog.png

* Delete source/_static/ConfigDialogChinese.png

* Delete source/_static/ConfigDialogEnglish.png

* Delete source/_static/UnsafeFiles.png

* Delete source/_static/HomeTab.png

* Delete source/_static/DigitalSignature.png

* Delete source/_static/CaseInsensitive.png

* Delete source/_static/CheckAll.gif

* Delete source/_static/PolicyDefault.png

* Delete source/_static/release.svg

* Delete source/_static/LegacyDNResolved.png

* Delete source/_static/LegacyDN.png

* Delete source/_static/PolicyUserConfig.png

* Delete source/_static/PolicyTrustedDomains.png

* Delete source/_static/PolicyADMX.png

* Update sitemap.xml

* Update index.html

* Delete source/quickstart.rst

It is trashed.

* Revert "Update index.html"

This reverts commit 6424659.

* Fix table definition

* Fix parenthesis

* Fix feature table contents

* Fix environment table

* feature: make title overline long

* index: fix raw::html block

* Fix a typo

* feature: remove needless bullet point

* Resolve build warnings for service.rst

* service: fix typos

* service: fix inqueries format

* Hide empty section navigation

Ref: pydata/pydata-sphinx-theme#1662

* Fix a typo

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Co-authored-by: Yukiko Yoshimoto <[email protected]>

Author: HashidaTKS