Fix broken link to the annexes

[skounis]

In the text of the ARF, there are several links to sections in the Annexes. Most of these are broken and do not direct to the correct URL.

Some examples follow:

Section "2.1 Identification and authentication to access online services", paragraph 4

Details on PID issuance requirements, the PID attribute schema, and the Trust Infrastructure are further elaborated in the respective chapters - specifically Chapter 3 - Ecosystem, Chapter 5 - Attestations and Chapter 6 - Trust Model, Annex 2 (High level requirements in [Topic 2], [Topic 10] and [Topic 23], and Annex 3.1 - PID Rulebook.

Section "2.3 Mobile Driving Licence", paragraph 3

(Q)EAA issuance requirements, mDL attribute schema and Trust Infrastructure details are further detailed specifically in Chapter 3 - Ecosystem, Chapter 5 - Attestations, and in Annex 2 - [Topic 2], [Topic 3], [Topic 10] and [Topic 23].

Section "4.2.2 Attestation presentation flows", paragraph 3

Specific use cases integrate one or more of these flows. For detailed user journeys across various use cases, please refer to the blueprints in Annex 4 of the ARF.

Tasks

1. [x] Identify and collect all the broken links
2. [x] Fix the target URLs

[skounis]

Use regexp

1. find (?<=\b\w+)(?:_)(?=\w*\.md\b), replace annexes/annex-$1/
2. find (.+)_(.+\.md), replace (.+)-(.+\.md) - repeat until replace all