docs: Add release notes for v8.0.13

docs: Add release notes for v8.0.12

docs: Add release notes for v8.0.11

docs: Add release notes for v8.0.10

docs: Add release notes for v8.0.9

docs: Add release notes for v8.0.8

docs: Add release notes for v8.0.7

docs: Add release notes for v8.1.0a6

docs: Add release notes for v8.0.6

docs: DIRAC release v7r3p34 notes and tags