devel: Remove the spdx package

it's not ready to be published.

docs/devel/api-reference.rst

@@ -35,7 +35,6 @@ by components:
    swh.scheduler <swh-scheduler/index>
    swh.scrubber <swh-scrubber/index>
    swh.search <swh-search/index>
-   swh.spdx <swh-spdx/index>
    swh.storage <swh-storage/index>
    swh.vault <swh-vault/index>
    swh.web <swh-web/index>

docs/devel/index.rst

@@ -192,9 +192,6 @@ swh.docs
 :ref:`swh.search <swh-search>`
     search engine for the archive
 
-:ref:`swh.spdx <swh-spdx>`
-    Package to assist the generation of SBOMs(spdx format)
-
 :ref:`swh.storage <swh-storage>`
     abstraction layer over the archive, allowing to access all stored source
     code artifacts as well as their metadata

requirements-swh-dev.txt

@@ -31,7 +31,6 @@
 ../swh-scheduler[simulator]
 ../swh-scrubber
 ../swh-search
-../swh-spdx
 ../swh-storage
 ../swh-vault
 ../swh-web

requirements-swh.txt

@@ -26,7 +26,6 @@ swh.scanner
 swh.scheduler[simulator]
 swh.scrubber
 swh.search
-swh.spdx
 swh.storage
 swh.vault
 swh.web