HiddenService not set up in torrc file because of sed expression error

I tried installing the [standup script](https://github.com/BlockchainCommons/Bitcoin-Standup-Scripts/blob/master/Scripts/LinodeStandUp.sh) following your [directions](https://github.com/BlockchainCommons/Learning-Bitcoin-from-the-Command-Line/blob/master/02_1_Setting_Up_a_Bitcoin-Core_VPS_with_StackScript.md#21-setting-up-a-bitcoin-core-vps-with-bitcoin-standup). I noticed that the HiddenService lines were not added to my `/etc/tor/torrc`. Then, I saw this error in `/standup.err`:

```
standup@localhost:~$ grep ^sed /standup.err
sed: -e expression #1, char 253: unknown option to `s'
```

I was able to reproduce the error by running the code https://github.com/BlockchainCommons/Bitcoin-Standup-Scripts/blob/master/Scripts/LinodeStandUp.sh#L214-L225:

```
standup@localhost:~$ sed -i -e 's/## address y:z./## address y:z.\
\
HiddenServiceDir \/var\/lib\/tor\/standup\/\
HiddenServiceVersion 3\
HiddenServicePort 18332 127.0.0.1:18332\
HiddenServicePort 18443 127.0.0.1:18443\
HiddenServicePort 8332 127.0.0.1:8332\
\
HiddenServiceDir \/var/\lib/\tor/\cypherpunkpay\
HiddenServiceVersion 3\
HiddenServicePort 8081 127.0.0.1:8081\
/g' /etc/tor/torrc
sed: -e expression #1, char 253: unknown option to `s'
```

I think the problem is [this line](https://github.com/BlockchainCommons/Bitcoin-Standup-Scripts/blob/master/Scripts/LinodeStandUp.sh#L222) that doesn't properly escape the directory forward slashes. It needs changed to:

`HiddenServiceDir \/var\/lib\/tor\/cypherpunkpay\`

Start with Scripts/LinodeStandUp.sh around lines 214-225 and reproduce the sed command against /etc/tor/torrc, checking /standup.err for the reported expression error. Update the HiddenServiceDir entry so the setup completes and the HiddenService lines are added to torrc without the sed error.

Written by the indexing model from the issue text.