[DOC] Improve README wording
[DOC] Improve README wording

rubo77/meshviewer-1,FreifunkBremen/meshviewer-ffrgb,Freifunk-Troisdorf/meshviewer,hopglass/ffrgb-meshviewer,FreifunkBremen/meshviewer-ffrgb,FreifunkMD/Meshviewer,xf-/meshviewer-1,Freifunk-Rhein-Neckar/meshviewer,rubo77/meshviewer-1,Freifunk-Rhein-Neckar/meshviewer,hopglass/ffrgb-meshviewer,ffrgb/meshviewer,Freifunk-Rhein-Neckar/meshviewer,freifunkMUC/meshviewer,freifunkMUC/meshviewer,Freifunk-Troisdorf/meshviewer,xf-/meshviewer-1,ffrgb/meshviewer,FreifunkMD/Meshviewer