UI Tweaks

description:

@oonagh.mannix and @v.hofmann have discussed a few small changes to be implemented in the UI. This issue can also be used to accumulate and discuss others.

to implement:

• change to next/previous buttons on individual term page (see comment below)
• remove bar with "other contributors" from contributors page (see comment below)
• change appearance of "join us"-bar (see comment below)
• increase vertical size of 3 boxes on landing page (e.g. 120 - 130% of current height)
• increase padding of logos on adopters page (see comment below)

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## not relevant in this issue moved to #71 (closed) :

• Use of "!" in headings
• Check for consistency in EM Glossary vs EM-Glossary
• Consistency in artifact vs artefact