ChangeLog.txt updates

- migrated Docs-PB to Docs-MB in browser project
- updated browser build script to take new path into account
- created separate ChangeLog-MB.txt softlink, migrate ChangeLog.txt softlink
  to ChangeLog-TBB.txt
- updated changelog-format-blog-post script to reference correct file and
  fix bug in raw changelog link

ChangeLog-MB.txt

+projects/browser/Bundle-Data/Docs-MB/ChangeLog.txt
\ No newline at end of file

projects/browser/build

@@ -241,7 +241,7 @@ do
       [% IF ! c("var/namecoin") %]--exclude=*Electrum-NMC* --exclude=*ncprop279*[% END %] \
       -c . | tar -C "$tbdir[% IF ! c("var/macos") %]/[% c('var/ProjectName') %][% END %]" -x
   [% ELSIF c("var/mullvad-browser") -%]
-    cp -a Bundle-Data/Docs-PB/* "$tbdir/$DOCSPATH"
+    cp -a Bundle-Data/Docs-MB/* "$tbdir/$DOCSPATH"
   [% END -%]
 done
 

tools/changelog-format-blog-post

@@ -12,7 +12,7 @@ sub version_type {
 
 my ($changelog, $current_tbversion, $last_tbversion);
 
-if (!open(CHANGELOG, '<', "$FindBin::Bin/../ChangeLog.txt")) {
+if (!open(CHANGELOG, '<', "$FindBin::Bin/../ChangeLog-TBB.txt")) {
   print STDERR "Error opening changelog file\n";
   exit 1;
 }
@@ -49,6 +49,6 @@ if (! ( $current_tbversion =~ m/a/ ) ) {
   my @v = split(/\./, $current_tbversion);
   $changelog_branch = "maint-$v[0].$v[1]";
 }
-print "The full changelog since [Tor Browser $last_tbversion](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/raw/$changelog_branch/projects/browser/Bundle-Data/Docs/ChangeLog.txt) is:\n\n";
+print "The full changelog since [Tor Browser $last_tbversion](https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/raw/$changelog_branch/projects/browser/Bundle-Data/Docs-TBB/ChangeLog.txt) is:\n\n";
 
 print $changelog;