DOC: Removed (partly migrated) documentation directory `/doc/`

See merge request !93

DOC: enhance query documentation

See merge request !89

FIX server#143

See merge request !90

FIX: fix for 203

See merge request !86

Squashed commit of the following:

commit c30dc88c
Author: Timm Fitschen <t.fitschen@indiscale.com>
Date:   Thu Apr 13 23:10:16 2023 +0200

    PIPELINE

commit 3a9298f8
Author: Timm Fitschen <t.fitschen@indiscale.com>
Date:   Thu Apr 13 16:30:58 2023 +0200

    PIPELINE

commit e7a0bed3
Author: Timm Fitschen <t.fitschen@indiscale.com>
Date:   Thu Apr 13 16:02:20 2023 +0200

    PIPELINE

commit c2716dae
Author: Timm Fitschen <t.fitschen@indiscale.com>
Date:   Thu Apr 13 15:54:26 2023 +0200

    PIPELINE

commit 1cb8836f
Author: Timm Fitschen <t.fitschen@indiscale.com>
Date:   Thu Apr 13 15:48:55 2023 +0200

    PIPELINE

commit 9c261be1
Author: Timm Fitschen <t.fitschen@indiscale.com>
Date:   Thu Apr 13 15:37:25 2023 +0200

    PIPELINE

fixing server issue #196

See merge request !84

# Conflicts:
#   CHANGELOG.md

FIX for #166

See merge request !88