fix deposition link in the footer

Author: nuest

inst/extdata/templates/cert/index_postfix_template.html

@@ -15,7 +15,7 @@
                 src="https://mirrors.creativecommons.org/presskit/buttons/88x31/svg/by-sa.svg"></a>
     </p>
 
-    <p><a href="https://doi.org/10.5281/zenodo.4059767"><img src="https://zenodo.org/badge/DOI/10.5281/zenodo.4059767.svg" alt="DOI of Zenodo Deposit"></a></p>
+    <p><a href="https://doi.org/10.5281/zenodo.4059767"><img src="https://zenodo.org/badge/DOI/10.5281/zenodo.4059767.svg" alt="DOI of Zenodo Deposit">https://doi.org/10.5281/zenodo.4059767</a></p>
 
     <p class="footer-description">CODECHECK is a process for independent execution of
         computations underlying scholarly research articles.</p>

inst/extdata/templates/non_reg_tables/index_postfix_template.html

@@ -18,7 +18,7 @@
                 src="https://mirrors.creativecommons.org/presskit/buttons/88x31/svg/by-sa.svg"></a>
     </p>
 
-    <p><a href="https://doi.org/10.5281/zenodo.4059767"><img src="https://zenodo.org/badge/DOI/10.5281/zenodo.4059767.svg" alt="DOI of Zenodo Deposit"></a></p>
+    <p><a href="https://doi.org/10.5281/zenodo.4059767"><img src="https://zenodo.org/badge/DOI/10.5281/zenodo.4059767.svg" alt="DOI of Zenodo Deposit">https://doi.org/10.5281/zenodo.4059767</a></p>
 
     <p class="footer-description">CODECHECK is a process for independent execution of
         computations underlying scholarly research articles.</p>

inst/extdata/templates/reg_tables/index_postfix_template.html

@@ -23,7 +23,7 @@
                 src="https://mirrors.creativecommons.org/presskit/buttons/88x31/svg/by-sa.svg"></a>
     </p>
 
-    <p><a href="https://doi.org/10.5281/zenodo.4059767"><img src="https://zenodo.org/badge/DOI/10.5281/zenodo.4059767.svg" alt="DOI of Zenodo Deposit"></a></p>
+    <p><a href="https://doi.org/10.5281/zenodo.4059767"><img src="https://zenodo.org/badge/DOI/10.5281/zenodo.4059767.svg" alt="DOI of Zenodo Deposit">https://doi.org/10.5281/zenodo.4059767</a></p>
 
     <p class="footer-description">CODECHECK is a process for independent execution of
         computations underlying scholarly research articles.</p>