We cannot check links to learntechlib.org anymore. Also replace some …

…older Morphic tutorials to what got archived via web.archive.org.

Rakefile

@@ -20,7 +20,8 @@ task :test do
           /^(https?\:\/\/)?(www\.)?doi\.org\/10\.1145\/.+$/,
           /^(https?\:\/\/)?(www\.)?portal\.acm\.org\/citation\.cfm.+$/,
           /^(https?\:\/\/)?(www\.)?github\.com\/search\?.+$/,
-          /^(https?\:\/\/)?(www\.)?aidaweb\.si\/.*$/ ],
+          /^(https?\:\/\/)?(www\.)?aidaweb\.si\/.*$/,
+          /^(https?\:\/\/)?(www\.)?learntechlib\.org\/p\/.+$/ ],
         :typhoeus => {
           :ssl_verifypeer => false,
           :ssl_verifyhost => 0 }

_documentation/videos.md

@@ -10,4 +10,4 @@ category:   Getting Started with Squeak
 
 [gsws]: https://www.hpi.uni-potsdam.de/swa/trac/SqueakCommunityProjects/wiki/squeak_screencasts
 [ytvle]: https://www.youtube.com/user/sparaig
-[wswm]: https://www.waveplace.com/courseware/basic-etoys/beta.jsp
+[wswm]: https://web.archive.org/web/20210307192813/https://www.waveplace.com/courseware/basic-etoys/beta.jsp