Update README.md - grammar and writing fixes

[oddlittlebird]

Feature Preview

This PR makes minor improvements to the README, including:

• Make headings consistently sentence case. They were previously some title case and some sentence case.
• Replaced vague link text such as "here" with specific link text.
• Removed unnecessary bolding.
• Added periods to the ends of sentences.
• Minor grammar edits.

PR Checklist

• [ x] My code adheres to AppFlowy's Conventions
• [ yes] I've listed at least one issue that this PR fixes in the description above.
• [NA ] I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• [ x] All existing tests are passing.

Summary by Sourcery

Update README.md with consistent heading casing, clearer link text, improved punctuation, and minor grammar edits

Documentation:

• Normalize all headings to sentence case
• Replace vague link text (e.g., "here") with descriptive text
• Remove unnecessary bold formatting from the document
• Add periods at the end of sentences
• Apply minor grammar corrections across the README

[sourcery-ai]

Reviewer's Guide

This PR updates the README.md to enforce consistent sentence-case headings, improve link descriptions, and correct punctuation and grammar through targeted text edits without altering structure.

File-Level Changes

Change	Details	Files
Normalized headings to sentence case	Changed “User Installation” to “Installation options” Changed “Built With” to “Built with” Changed “Stay Up-to-Date” to “Stay up-to-date” Changed “Getting Started with development” to “Getting started with development” Removed bold markup from “Releases” header Lowercased “Why Are We Building This?” to “Why are we building this?”	README.md
Refined link text wording and placement	Replaced vague “here” links with descriptive labels Consolidated OS-specific instructions into a single “Building from Source” reference Clarified feature request and bug report sentences Updated changelog link phrasing	README.md
Standardized punctuation and formatting	Added periods at ends of list items and sentences Removed unnecessary bold styling around headings Adjusted spacing around emojis and symbols	README.md
Performed minor grammar refinements	Replaced “which” with “that” for restrictive clauses Added hyphen in “OS-specific” Reworded segments for clarity and flow	README.md

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[sourcery-ai]

Hey @oddlittlebird - I've reviewed your changes and they look great!

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