Merge pull request #430 from cnotin/patch-1

Add .well-known entries

Source: 
- https://gist.github.com/quickbreach/3bddfdf193b3d988b0e07d07dbac0da0
- https://www.iana.org/assignments/well-known-uris/well-known-uris.xhtml
- https://mercure.rocks/spec#discovery

Discovery/Web-Content/common.txt

@@ -39,6 +39,7 @@
 .well-known/csvm
 .well-known/dnt
 .well-known/dnt-policy.txt
+.well-known/dots
 .well-known/ecips
 .well-known/enterprise-transport-security
 .well-known/est
@@ -52,6 +53,7 @@
 .well-known/keybase.txt
 .well-known/looking-glass
 .well-known/matrix
+.well-known/mercure
 .well-known/mta-sts.txt
 .well-known/mud
 .well-known/nfv-oauth-server-configuration
@@ -63,6 +65,7 @@
 .well-known/openpgpkey
 .well-known/pki-validation
 .well-known/posh
+.well-known/pvd
 .well-known/reload-config
 .well-known/repute-template
 .well-known/resourcesync