Make more button tooltip-able

[monicfenga]

Bito 1.1.4 added a few more buttons on the top, respectively:

• Help
• Community
• Twitter
• BIto homepage these buttons don't have tooltip, may cunfuse user?

[bitomukesh]

thanks for pointing this out. will fix it,

[monicfenga]

@bitomukesh and also, share button's icon is way too small compared to older version (it should be the same size as "🗑" button)