Remove references to Travis CI

Also cleans up a Riot reference as well

Part of https://github.com/vector-im/element-web/issues/15098

CONTRIBUTING.rst

@@ -1,4 +1,4 @@
-Contributing code to Riot
-=========================
+Contributing code to Element
+============================
 
-Riot follows the same pattern as https://github.com/matrix-org/matrix-js-sdk/blob/master/CONTRIBUTING.rst.
+Element follows the same pattern as https://github.com/matrix-org/matrix-js-sdk/blob/master/CONTRIBUTING.rst.

scripts/fetch-develop.deps.sh

@@ -70,7 +70,6 @@ function dodep() {
 
 ##############################
 
-echo -en 'travis_fold:start:matrix-js-sdk\r'
 echo 'Setting up matrix-js-sdk'
 
 dodep matrix-org matrix-js-sdk
@@ -83,11 +82,8 @@ popd
 
 yarn link matrix-js-sdk
 
-echo -en 'travis_fold:end:matrix-js-sdk\r'
-
 ##############################
 
-echo -en 'travis_fold:start:matrix-react-sdk\r'
 echo 'Setting up matrix-react-sdk'
 
 dodep matrix-org matrix-react-sdk
@@ -101,8 +97,6 @@ popd
 
 yarn link matrix-react-sdk
 
-echo -en 'travis_fold:end:matrix-react-sdk\r'
-
 ##############################
 
 # Link the reskindex binary in place: if we used `yarn link`,