Refactor activity post designs for web

Activity posts currently occupy a lot of vertical space within the feed and are generally quite noisy. There are numerous design tweaks that could be made to contain the overall height a post occupies.

This is a beneficial update in isolation, but also stands to benefit replies in the future.


## Desktop Prototype
* [Prototype](https://www.figma.com/proto/oYPYya9Z4G5wqgLvdKDbOB/Revised-Activity-Post?page-id=0%3A1&node-id=3%3A975&viewport=241%2C48%2C1&scaling=min-zoom&starting-point-node-id=3%3A975) 


### Pure text posts
- [ ] [Standard text posts](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=416%3A4682) - posts fives lines of longer
- [ ] [Short - very large text](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=416%3A4682) - up to two lines of text
- [ ] [Medium  - larger text](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=416%3A4682) - up to four lines of text
- [ ] [Very long text](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=378%3A2521) - when over 10 lines, the text should be cut off with a 'see more' toggle

### Comments
- [ ] [Activity post with comments](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=387%3A2751)
- [ ] [Visible comments](https://www.figma.com/file/oYPYya9Z4G5wqgLvdKDbOB/Revised-Activity-Post?node-id=9%3A1286)


### Embedded URLs
- [ ] [Full Embed](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=375%3A2472)
- [ ] [Condensed Embed](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=361%3A3086)


### Images/Videos with text
- [ ] [Short text with landscape image](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=362%3A3145)
- [ ] [Short text with square image](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=377%3A2468)
- [ ] [Short text with portrait image](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=303%3A2813)
- [ ] [Short text with very tall image](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=363%3A3203) -  logic TBC
- [ ] Portrait video example (displayed in same manner as images) https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=598%3A4520


### Locked posts
- [ ] [NSFW](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=419%3A3002)
- [ ] [Minds+ image with text](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=380%3A2586)
- [ ] [Minds+ text only](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=418%3A2899)
- [ ] [Membership Tiers](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=423%3A4037)

### Other
- [ ] [Reminded post](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=359%3A2948)
- [ ] [Boosted post](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=361%3A3016)
- [ ] [Quote post](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=322%3A2140)
- [ ] [Permaweb example](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=420%3A3097)
- [ ] Dedicated post page - TBC
- [ ] [Post owner](https://www.figma.com/file/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?node-id=434%3A4617) - Boost option and view count. View count to be removed for non-owners.

### Responsive mobile
- [ ] [Mobile responsive post structure](https://www.figma.com/proto/EkJej3mKP2lSzmWTLoqlXD/Minds-Design-System?page-id=164%3A1817&node-id=423%3A4345&viewport=241%2C48%2C1&scaling=scale-down&starting-point-node-id=423%3A4345)

* Post view count is hidden
* Channel handle is hidden, where a display name is present
* Note also the reduced spacing around the outside of the post.
* To-do - frame comments within


### Clarifications
* Metric to capture
  * By virtue of the new designs, post impressions will undoubtedly increase.
  * Increased post click through - on images/videos.
  * Post engagements (likes, reminds, replies)

Story points: 13.0