Add PDF Shortcut (#672)

* Add Blogtrottr as newsletter provider

* Fixed absLangURL issue with sections in footer

* Added embed-pdf shortcode

pdf-js is sered locally to preserve privacy and comply with GDPR

Co-authored-by: Emruz Hossain <hossainemruz@gmail.com>

static/js/pdf-js/web/cmaps/CNS2-V.bcmap

@@ -0,0 +1,3 @@
+àRCopyright 1990-2009 Adobe Systems Incorporated.
+All rights reserved.
+See ./LICENSEáCNS2-H

static/js/pdf-js/web/cmaps/ETenms-B5-H.bcmap

@@ -0,0 +1,3 @@
+àRCopyright 1990-2009 Adobe Systems Incorporated.
+All rights reserved.
+See ./LICENSEá	ETen-B5-H`
 ^

static/js/pdf-js/web/cmaps/GB-H.bcmap

@@ -0,0 +1,4 @@
+àRCopyright 1990-2009 Adobe Systems Incorporated.
+All rights reserved.
+See ./LICENSE

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