docs: prune tags in readme to 5

[stklcode]

keep: cache, caching, performance, speed

remove: acceleration, minimize, apc, disk, hdd, memcached, compression, minify

add: optimize

[lloc]

The set of keywords seems ok to me. Other plugins of the same category use core web vitals and similar. Introducing speed may be fine too.

[stklcode]

Plugins with the proposed 5 tags:

• https://wordpress.org/plugins/tags/performance/ (387)
• https://wordpress.org/plugins/tags/cache/ (290)
• https://wordpress.org/plugins/tags/speed/ (177)
• https://wordpress.org/plugins/tags/optimize/ (133)
• https://wordpress.org/plugins/tags/caching/ (98)

and

• https://wordpress.org/plugins/tags/core-web-vitals/ (29)

I do not have a strong opinion on this one. cache + caching seems redundant, performance and optimize little too general... Just removed some, but open to replace any of them.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[stklcode]

Let's go with the proposed 5. We can simply update the readme again if we want to optimize the tags again.