readme: add links to documentation

Let's make it easier for new users to find information.

Signed-off-by: Robin Jarry <robin@jarry.cc>
Reviewed-by: Moritz Poldrack <moritz@poldrack.dev>

README.md

@@ -23,12 +23,29 @@ If you redirect stdout to a file, logging output will be written to that file:
 
     $ aerc > log
 
-For instructions and documentation: see `man aerc` and further specific man
-pages on there.
-
 Note that the example HTML filter (off by default), additionally needs `w3m` and
 `dante` to be installed.
 
+### Documentation
+
+Also available as man pages:
+
+- [aerc(1)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc.1.scd)
+- [aerc-config(5)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc-config.5.scd)
+- [aerc-imap(5)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc-imap.5.scd)
+- [aerc-maildir(5)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc-maildir.5.scd)
+- [aerc-notmuch(5)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc-notmuch.5.scd)
+- [aerc-search(1)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc-search.1.scd)
+- [aerc-sendmail(5)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc-sendmail.5.scd)
+- [aerc-smtp(5)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc-smtp.5.scd)
+- [aerc-stylesets(7)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc-stylesets.7.scd)
+- [aerc-templates(7)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc-templates.7.scd)
+- [aerc-tutorial(7)](https://git.sr.ht/~rjarry/aerc/tree/master/item/doc/aerc-tutorial.7.scd)
+
+User contributions and integration with external tools:
+
+- [wiki](https://man.sr.ht/~rjarry/aerc/)
+
 ## Installation
 
 ### Binary Packages