update to mention BaseprintLens

Author: castedo

docs/index.md

@@ -24,8 +24,6 @@ Snapshots vs. Successions
 
 [Baseprint Document Format (BpDF)](bpdf/index.md) is the
 digital encoding format for *Baseprint document snapshots*,
-which can be redistributed and archived through various mechanisms.
-Some preprint servers could archive Baseprint document snapshots in a centralized
-approach.
-Alternatively, Baseprint document snapshots can be redistributed and archived
-in a distributed approach, such as [*Baseprint document successions*](successions.md).
+which are redistributed and archived as
+[*Baseprint document successions*](successions.md) in the [Software Heritage
+Archive](https://softwareheritage.org) and [GitHub](https://github.com).

docs/successions.md

@@ -19,6 +19,11 @@ DSI, DSGL, and [BpDF](bpdf/index.md) together encode Baseprint document successi
 [Document Succession Highly Manual Toolkit](https://manual.perm.pub):
 :   Manual for a software toolkit that reads/writes document successions in DSGL.
 
+[BaseprintLens](https://gitlab.com/perm.pub/baseprintlens):
+:   the open-source [Single-Page Application](https://en.wikipedia.org/wiki/Single-page_application) (SPA)
+    that is deployed at [lens.perm.pub](https://lens.perm.pub)
+    and can be [deployed to other independent websites](https://try.perm.pub/tutorial/host_website/).
+
 [BaseprintPress](https://gitlab.com/perm.pub/baseprintpress):
 :   Software that generates web pages from Baseprint document successions.
     For a tutorial, see ["Generate Pages for a Published Digital Succession"](https://try.perm.pub/tutorial/gen_pages/).