This should help avoid leaking information about (non)existence of Send
and be more in line with what official server returns.

Add support for the Disable Send policy

Upstream refs:

* https://github.com/bitwarden/server/pull/1130
* https://bitwarden.com/help/article/policies/#disable-send

CORS fixes

Send access check fixes

Adjust checks for max access count, expiration date, and deletion date.
The date checks aren't that important, but the access count check
currently allows one more access than it should.

This is only implemented for the database specific structs, which is not what we want

* The Safari extension apparently now uses the origin `file://` and expects
  that to be returned (see bitwarden/browser#1311, bitwarden/server#800).

* The `Access-Control-Allow-Origin` header was reflecting the value of the
  `Origin` header without checking whether the origin was actually allowed.
  This effectively allows any origin to interact with the server, which
  defeats the purpose of CORS.

Add a dot in find command.

Add a dot indicting current directory to search by find.

find in mac won't work without the dot

Fix custom org name in invitation confirmation email

The org name in the invitation email was made customizable in 8867626d, but
the org name is still hardcoded as "bitwarden_rs" in the confirmation email.

Remove `md5.js` dependency

Check for data folder on startup

Currently, when starting up for the first time (running standalone, outside
of Docker), bitwarden_rs panics when the `openssl` tool isn't able to create
`data/rsa_key.pem` due to the `data` dir not existing. Instead, print a more
helpful error message telling the user to create the directory.

Allow only bug report issues

Remove templates for other issue types, directing them to the forum instead.

Switch to the built-in WebCrypto APIs for computing identicon hashes.

Change `twofactorauth.org` to `2fa.directory`

The `twofactorauth.org` has apparently been sold to some company for
marketing purposes.

Remove unnecessary allocations

Update Alpine base images to 3.13