Fix accessibility issues reported

[sroertgen]

Issues found by automated test on these pages:

• https://skohub.io

• [x] Prüfschritt 0.0.1 Erklärung zur Barrierefreiheit vorhanden

• [ ] Prüfschritt 0.0.3 Erläuterungen in Gebärdensprache vorhanden

• [ ] Prüfschritt 0.0.4 Erläuterungen in Leichter Sprache vorhanden

• [x] Prüfschritt 9.1.1.1 Nicht-Text-Inhalt

• [ ] Prüfschritt 12.2.3 Effektive Kommunikation

Extracted from 927_2023-09-05_12_32_BF_Pruefbericht_vereinfacht.pdf

[Phu2]

We need to provide a short alt text for this image

https://skohub-io.github.io/skohub.io/img/skohub-stage.svg

@sroertgen Can you come up with a suggestion?

[sroertgen]

"Illustration of the SkoHub modules SkoHub Vocabs, SkoHub Reconcile and SkoHub PubSub interacting with other open protocols and APIs like ActivityPub or the Reconciliation Service API."

[Phu2]

Re "Prüfschritt 12.2.3 Effektive Kommunikation" see https://ergebnis.bitvtest.de/pruefschritt/bitv-20-web/bitv-20-web-12-2-3-effektive-kommunikation

ob eine Kontaktmöglichkeit zum Support über mindestens zwei verschiedene Kommunikations-Kanäle (z.B. Telefon und E-Mail) zur Verfügung steht

How about adding @acka47 's phone number (already published here) to https://lobid.org/team/ and link to this page?

[acka47]

How about adding @acka47 's phone number (already published here) to https://lobid.org/team/ and link to this page?

The phone number is already there: https://lobid.org/team/ap/

[Phu2]

The phone number is already there: https://lobid.org/team/ap/

jep, the phone number is included on most team members' page :+1: hopefully this is sufficient in terms of accessibility requirements.

Should we link to https://lobid.org/product/skohub/ or to https://lobid.org/team/ as the contact page for skohub.io?