MAINT: linkahead rename

Summary

• in User Documentation (online, readmes, other doc folders)
• depricate old imports
• add new ways to import
• search and replace in remaining files; change only if it has no functional implications

Test Environment

pipelines

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
  • How do I use the software? Assume "stupid" users.
  • How do I develop or debug the software? Assume novice developers.
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

.docker/cert.sh

@@ -24,18 +24,18 @@
 # Creates a directory `cert` and certificates in this directory.
 #
 # The hostname for which the certificate is created can be changed by setting
-# the environment variable CAOSHOSTNAME.
+# the environment variable LINKAHEADHOSTNAME.
 #
 # ## Overview of variables ##
 #
-# - CAOSHOSTNAME :: Hostname for the key (localhost)
+# - LINKAHEADHOSTNAME :: Hostname for the key (localhost)
 # - KEYPW :: Password for the key (default ist CaosDBSecret)
 # - KEYSTOREPW :: Password for the key store (same as KEYPW)
 function cert() {
     mkdir -p cert
     cd cert
     KEYPW="${KEYPW:-CaosDBSecret}"
-    CAOSHOSTNAME="${CAOSHOSTNAME:-localhost}"
+    LINKAHEADHOSTNAME="${LINKAHEADHOSTNAME:-localhost}"
     KEYSTOREPW="${KEYPW:-}"
     # NOTE: KEYPW and KEYSTOREPW are the same, due to Java limitations.
     KEYPW="${KEYPW}" openssl genrsa -aes256 -out caosdb.key.pem \
@@ -43,7 +43,7 @@ function cert() {
     # Certificate is for localhost
     KEYPW="${KEYPW}" openssl req -new -x509 -key caosdb.key.pem \
          -out caosdb.cert.pem -passin env:KEYPW \
-         -subj "/C=/ST=/L=/O=/OU=/CN=${CAOSHOSTNAME}"
+         -subj "/C=/ST=/L=/O=/OU=/CN=${LINKAHEADHOSTNAME}"
     KEYPW="${KEYPW}" KEYSTOREPW="$KEYSTOREPW" openssl pkcs12 -export \
          -inkey caosdb.key.pem -in caosdb.cert.pem -out all-certs.pkcs12 \
          -passin env:KEYPW -passout env:KEYPW