Improve docs for openvasd http v1 API

Use markdown for all sources.

Author: bjoernricks

docs/api/health.rst

@@ -0,0 +1,16 @@
+(http)=
+
+# HTTP APIs
+
+```{eval-rst}
+.. automodule:: gvm.protocols.http
+```
+
+The following modules are provided:
+
+```{eval-rst}
+.. toctree::
+    :maxdepth: 1
+
+    openvasdv1
+```

docs/api/http.md

@@ -0,0 +1,18 @@
+(openvasdv1)=
+
+# openvasd v1
+
+```{eval-rst}
+.. automodule:: gvm.protocols.http.openvasd
+    :members:
+```
+
+```{toctree}
+:hidden:
+
+openvasdv1/health
+openvasdv1/metadata
+openvasdv1/notus
+openvasdv1/scans
+openvasdv1/vts
+```

docs/api/http.rst

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+# Health API
+
+```{eval-rst}
+.. automodule:: gvm.protocols.http.openvasd._health
+   :members:
+```

docs/api/metadata.rst

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+# Metadata API
+
+```{eval-rst}
+.. automodule:: gvm.protocols.http.openvasd._metadata
+   :members:
+```

docs/api/notus.rst

@@ -0,0 +1,6 @@
+# Notus API
+
+```{eval-rst}
+.. automodule:: gvm.protocols.http.openvasd._notus
+   :members:
+```