ihp-hsx: Updated bounds

Improve docs on how to get latest `master` (digitallyinduced#1755)

* Improve docs on how to get latest master

* Improve docs

* Apply suggestions from code review

Co-authored-by: Marc Scholten <[email protected]>

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Co-authored-by: Marc Scholten <[email protected]>

Switch to version number 1.0.1

Use 1.0.0 version number

Merge pull request digitallyinduced#1559 from digitallyinduced/docs-u…

…pdate-install

Use the new ihp-new package from nixpkgs for install instructions in the docs

Merge pull request digitallyinduced#1556 from digitallyinduced/drop-p…

…olicy-if-dropping-column

Drop policy if dropping column

Made log of queries a bit less verbose

Added upgrade instructions for v0.19.0

Fixed type inference of delete functions

Added upgrade step for SMTP